Understanding through Discussion


Welcome! You are not logged in. [ Login ]
EvC Forum active members: 85 (8924 total)
Current session began: 
Page Loaded: 08-17-2019 11:16 PM
25 online now:
DrJones*, Hyroglyphx, Minnemooseus (Adminnemooseus) (3 members, 22 visitors)
Chatting now:  Chat room empty
Newest Member: Jedothek
Post Volume:
Total: 859,867 Year: 14,903/19,786 Month: 1,626/3,058 Week: 404/868 Day: 43/70 Hour: 0/0


Thread  Details

Email This Thread
Newer Topic | Older Topic
  
1
2Next
Author Topic:   Introduction To Geology
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


(1)
Message 18 of 293 (634321)
09-20-2011 5:55 PM
Reply to: Message 1 by Dr Adequate
09-14-2011 5:39 AM


Before I start, I should like to know that there are people who want to read it, so please say so in response to this post.

In. I thought cheering Message 5 was enough, but now see all the others responding.

Enjoy


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 1 by Dr Adequate, posted 09-14-2011 5:39 AM Dr Adequate has not yet responded

Replies to this message:
 Message 24 by Panda, posted 09-21-2011 5:36 AM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 61 of 293 (641891)
11-23-2011 9:41 AM
Reply to: Message 60 by Dr Adequate
11-22-2011 12:50 PM


Re: Chemical Weathering
Hi Dr Adequate, thanks.

One of the other aspects of chemical weathering is that rocks form a crust over time, and the existence or absence of this crust can be used to determine if some stone artifacts have been worked or occur naturally.

Relative thicknesses of this crust can also be used to form relative dating of exposed rocks.

Enjoying your articles.


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 60 by Dr Adequate, posted 11-22-2011 12:50 PM Dr Adequate has responded

Replies to this message:
 Message 62 by Dr Adequate, posted 11-23-2011 1:38 PM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 81 of 293 (648514)
01-16-2012 9:23 AM
Reply to: Message 80 by Dr Adequate
01-16-2012 12:14 AM


Re: Deltas ... picture?
... as shown in the photograph at the start of this article.

?

Thanks


This message is a reply to:
 Message 80 by Dr Adequate, posted 01-16-2012 12:14 AM Dr Adequate has responded

Replies to this message:
 Message 82 by Dr Adequate, posted 01-16-2012 2:02 PM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 85 of 293 (650282)
01-29-2012 5:43 PM
Reply to: Message 83 by Dr Adequate
01-25-2012 12:53 AM


Re: Peat Swamps And Coal
Hi Dr Adequate, excellent.

Just a couple of small quibbles:

We can then ask ourselves: how else can such deposits form? To produce the extent and thickness of coal beds that we observe, we require a lot of plant matter to be deposited over a wide are in anoxic conditions, ...

[pendantmode] ... a wide area in anoxic conditions? [/pendantmode]

We can imagine peatification taking place in other environments besides swamps: for example, we can imagine a landslide transporting trees down a hillside into a so-called "dead" lake. The trees then might conceivably peatify and, if buried deeply enough under other sediments, coalify. But once again, we find that this would not account for the great depth and lateral extent of coal beds.

[creationistmode] or we can imagine great piles of organic debris deposited by the great flood of ~4kbc ... and compressed by the weight of the water during the flood ... [/creationistmode]

quote:
Pratt CC361.1
Response:

Coal deposits show evidence of a history. Most coals are found in sedimentary rocks deposited in flood plains. They often contain stream channels, roots, and soil horizons. Long time may not be necessary to form the coal itself, but it is necessary to account for the context where coal is found.


Rapid flood burial does not explain the great volume of coal world-wide that would have had to cover a pre-flood world, nor does it provide the heat necessary, nor does it provide a means to compress water out of the material (when the compression is accomplished by water), nor does it explain the gradations of coal deposits with depth (similar to the sorting of fossils problem).

Immediately underlying coal beds, we find paleosols, deposits which, as discussed in a previous argument, geologists identify as fossilized soils: most obviously, because they have fossilized roots in them. Indeed, the paleosols will sometimes have trees or tree-roots rooted in them, projecting up through the coal beds: furthermore, the trees are consistent with the fossil vegetation found in the coal. This fits well with the swamp theory of the origins of coal. The paleosols underlying coal beds (which are known as seat-earth, or underclay) also show the sort of soil characteristics we should expect to find in waterlogged soils.

[creationistmode] The existence of polystrate fossil trees is evidence of the great flood -- the tree should have decayed in one layer, not extend through many. [/creationistmode]

quote:
Pratt CC331:
Response:

Sudden deposition is not a problem for uniformitarian geology. Single floods can deposit sediments up to several feet thick. Furthermore, trees buried in such sediments do not die and decay immediately; the trunks can remain there for years or even decades.


Swampy areas can be periodically buried by a number of events (see above on coal formation context), including flash floods upstream. Some trees species are more tolerant of their roots being buried than others, and can continue to grow in such situations.

The "polystrate" trees (that are known) consist of trunks and roots, not full trees.

Enjoy.

NOTE: these comments should not be taken as a point to debate here - rather anyone interested in trying to rationalize creationist models should start a new thread.

Edited by Zen Deist, : no debate thread


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 83 by Dr Adequate, posted 01-25-2012 12:53 AM Dr Adequate has responded

Replies to this message:
 Message 86 by Dr Adequate, posted 01-29-2012 7:34 PM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 107 of 293 (659014)
04-11-2012 6:18 PM
Reply to: Message 103 by Taq
04-09-2012 6:09 PM


Craters of the Moon
Hi Taq,

Near Pocatello is the Craters of the Moon national park where you can check out massive lava fields:

http://en.wikipedia.org/...on_National_Monument_and_Preserve

Also has some magnificent cinder cones with paths to climb.

(And also a great place to see kestrels hovering and awesomely blue mountain bluebirds)

Enjoy.


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 103 by Taq, posted 04-09-2012 6:09 PM Taq has not yet responded

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 113 of 293 (659749)
04-18-2012 12:36 PM
Reply to: Message 108 by Dr Adequate
04-17-2012 2:12 AM


Re: Reefs
Hi Dr Adequate,

Reef-forming organisms

So do the shell deposits of foraminifera and diatoms constitute reefs? (the cliffs of Dover?) or is this a different phenomenon (ooids?)?

Reef-forming organisms

You could also have a combination of sessile organisms in a reef environment (such as barnacles, muscles and brachiopods, yes?

Reefs: how do we know?

Another way would be that upper layers grow attached to lower layers, rather than in loose piles. Not just corals (where this is rather obvious), but in oysters (as you mention) and brachiopods grow attached to a substrate, and in a mature ecology this substrate consists of previous generations of these organisms. Some of the extinct brachiopods found on Mt Everest were fossilized attached to their substrates, including other brachiopods, iirc.

http://en.wikipedia.org/wiki/Brachiopod

quote:
... In a typical brachiopod a stalk-like pedicle projects from an opening in one of the valves, known as the pedicle valve, attaching the animal to the seabed but clear of silt that would obstruct the opening. ...
... Brachiopods live only in the sea, and most species avoid locations with strong currents or waves. Articulate species have larvae that settle in quickly and form dense populations in well-defined areas, ...

These stalks are rather fragile, so fossil preservation of intact stalks indicates that the organisms were not disturbed after death, but buried gradually by natural silting processes and the growth of other generations of organisms.

Enjoy.

Edited by RAZD, : ooids?


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 108 by Dr Adequate, posted 04-17-2012 2:12 AM Dr Adequate has responded

Replies to this message:
 Message 114 by Dr Adequate, posted 04-18-2012 1:25 PM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 139 of 293 (668098)
07-17-2012 6:39 AM
Reply to: Message 138 by Dr Adequate
07-11-2012 11:49 AM


Re: Geomagnetic Reversals
to brighten your day

http://xkcd.com/

Enjoy


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 138 by Dr Adequate, posted 07-11-2012 11:49 AM Dr Adequate has not yet responded

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 156 of 293 (672444)
09-08-2012 9:50 AM
Reply to: Message 153 by Dr Adequate
09-07-2012 2:56 AM


Re: Core rotation
Hi Dr Adequate and Pollux,

When you get to that article, you can note that some species of corals have daily growth rings and that coral fossils (radio-metrically) dated to ~400,000 years ago show the earth rotated faster back then -- at ~400 days per year:

Age Correlations and An Old Earth, Version 2 No 1, Message 10 (shameless self promotion ... ):

quote:
... Is there something else that will give us an independent confirmation?

The answer is yes, and it comes from the astrophysics of the earth-moon system.

http://freepages.genealogy.rootsweb.com/...coral_growth.html (2)

quote:
The other approach, radically different, involves the astronomical record. Astronomers seem to be generally agreed that while the period of the Earth's revolution around the Sun has been constant, its period of rotation on its polar axis, at present 24 h, has not been constant throughout Earth's history, and that there has been a deceleration attributable to the dissipation of rotational energy by tidal forces on the surface and in the interior, a slow-down of about 2 sec per 100,000 years according to the most recent estimates. It thus appears that the length of the day has been increasing throughout geological time and that the number of days in the year has been decreasing. At, the beginning of the Cambrian the length of the day would have been 21 h ...

The best of the limited fossil material I have examined so far is from the MiddleDevonian ... Diurnal and annual growth-rates vary in the same individual, adding to the complexity, but in every instance there are more than 365 growth -lines per annum. usually about 400, ranging between extremes of 385 and 410. It is probably too much, considering the crudity of these data, to expect a narrower range of values for the number of days in a year in the Middle Devonian; many more measurements will be necessary to refine them.

A few more data may be mentioned: Lophophllidium from the Pennsylvanian (Conemaugh) of western Pennsylvania gave 390 lines per annum, and Caninia from the Pennsylvanian of Texas, 385. These results imply that the number of days a year has decreased with the passage of time since the Devonian, as postulated by astronomers.


I also found this graphic on this website although it was not used in the article:


Original at http://freepages.genealogy.rootsweb.com/...ogy/fig1wells.jpg (3)

This shows the smooth change in the length of days with time. The calculations based on just the astrophysics gives a 400 day/year figure for the Devonian and a 390 day/year figure for the Pennsylvanian, so there is very close accord between the predicted number of days, the measured number of days and the measured age of the fossil corals. These corals will be useful in anchoring the database of annual layers as it builds up a picture of climate change with age and extending, eventually, back into the Devonian period (360 to 408.5 million years ago).


Note that one of the causes for the slowing rotation rate is the tidal pull from the moon, and this decreases as the moon moves further and further from the earth (typical creationist mistake is to take today's rate and extrapolate it to the distant past).

There are as many hours in a year since the cambrian, but they are divide up into different length days -- ~21 hours and 424 days in the cambrian, ~22 hours and 400 days in the devonian, ~23 hours and 381 days in the triasic, and ~24 hours and 365 days today.

Astronomical planetary mechanics correlating with biological fossil records and radiometric dating information. Awesome.

Enjoy.

Edited by RAZD, : .

Edited by RAZD, : ..


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 153 by Dr Adequate, posted 09-07-2012 2:56 AM Dr Adequate has not yet responded

Replies to this message:
 Message 160 by dwise1, posted 09-08-2012 4:49 PM RAZD has responded

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 163 of 293 (672505)
09-08-2012 8:17 PM
Reply to: Message 160 by dwise1
09-08-2012 4:49 PM


topic disruption, sorry
Hi dwise1

In addition, there should probably be discussion of the various factors that account for the slowing down and speeding up of the earth's rotation, even though the net effect is slowing down. ...

Agreed, and nice posts.

I'm afraid my sort of off-hand comment is endangering this thread to go off topic, and I apologize to Dr. Adequate for this.

Enjoy.


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 160 by dwise1, posted 09-08-2012 4:49 PM dwise1 has not yet responded

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 164 of 293 (672523)
09-09-2012 6:26 AM
Reply to: Message 157 by Jzyehoshua
09-08-2012 2:33 PM


start a new topic if you want to pursue this further
Hi Jzyehoshua,

I see that you don't use the [qs]quotes are easy[/qs] or [quote]quotes are easy[/quote] formats, nor reply to specific posts (ie mine in this case), but use the general reply button instead. As has been pointed out in the past, these lower confusion and increase clarity: if you want to be obscure or hope to just be ignored then continue to do as you do.

Typical CREATIONIST mistake? Are you joking? Look up who tried to date the Earth's age from tidal friction: George Darwin, Charles' kid.

Logical fallacy: creationist still use the mistaken calculation, thus it still is a typical creationist mistake no matter who else committed the same calculation in the past and what the state of science was at that time.

If you want to pursue this further, I suggest you start a thread, or bring it to Scientific vs Creationist Frauds and Hoaxes if you can frame it to fit that thread.

This thread is about geology, which you could read and learn stuff -- I have

Enjoy


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 157 by Jzyehoshua, posted 09-08-2012 2:33 PM Jzyehoshua has not yet responded

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 190 of 293 (681090)
11-22-2012 1:33 PM
Reply to: Message 185 by Dr Adequate
10-17-2012 12:59 AM


Re: Igneous Rocks And Stratigraphy
Hi Dr Adequate.

Excellent as usual, but

When they are first formed, extrusive igneous rocks (lava flows and volcanic ash) will be younger than the sedimentary rocks below them, and will be younger than the sedimentary rocks above them.

bolded confusion

Enjoy


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 185 by Dr Adequate, posted 10-17-2012 12:59 AM Dr Adequate has responded

Replies to this message:
 Message 191 by Dr Adequate, posted 11-22-2012 3:18 PM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 195 of 293 (681513)
11-26-2012 7:55 AM
Reply to: Message 194 by Dr Adequate
11-26-2012 3:08 AM


Re: Varves
Hi Dr Adequate, small correction,

... over 50,000 in the case of Lake Suigetsu in Japan ...

Lake Suigetsu is a floating chronology that is tied to the present by aligning the 14C/12C ratios from fossils in the sediments to the ratios in the tree ring chronologies.

The actual number of varves that are countable cover a period of 29,100 years

http://www.sciencemag.org/cgi/content/abstract/279/5354/1187 (3)

quote:
The 14C/12C and 13C/12C ratios of more than 250 terrestrial macrofossils (leaves, twigs, and insect wings) in the sediments were measured by accelerator mass spectrometry (AMS) at the Groningen AMS facility (13), after proper sample pretreatment (14). The floating varve chronology was connected to the old part of the absolute tree-ring chronology (2, 15) by 14C wiggle matching (16), resulting in an absolute calendar age covering the time span from 8830 to 37,930 cal yr B.P. (17). The age beyond 37,930 cal yr B.P. is obtained by assuming a constant sedimentation in the Glacial.

Another example of varves that are commonly raise are the Green River varves:
http://adsabs.harvard.edu/abs/2001AGUFM.U12A0005M
http://www2.asa3.org/archive/asa/199801/0011.html

Enjoy.


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 194 by Dr Adequate, posted 11-26-2012 3:08 AM Dr Adequate has responded

Replies to this message:
 Message 196 by Dr Adequate, posted 11-26-2012 10:44 AM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 225 of 293 (684446)
12-17-2012 3:41 PM
Reply to: Message 221 by Dr Adequate
12-17-2012 12:19 PM


Re: U-Pb, Pb-Pb, And Fission Track Dating
Hi Dr Adequate,

typo?:

and plot a graph showing their 206Pb/204Pb ratios on one axis and their 206Pb/204Pb ratios on another

Shouldn't one of those be 207Pb/204Pb

thanks


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 221 by Dr Adequate, posted 12-17-2012 12:19 PM Dr Adequate has responded

Replies to this message:
 Message 226 by Dr Adequate, posted 12-17-2012 4:28 PM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 234 of 293 (684912)
12-19-2012 10:36 AM
Reply to: Message 232 by Dr Adequate
12-19-2012 3:05 AM


Re: Radiocarbon Dating - reservoir effect
Hi Dr Adequate,

To add to what Coyote said:

Marine carbon behaves quite differently from carbon in the terrestrial cycle. The residence time of carbon in the ocean can be measured in hundreds of thousands of years (where the residence time of carbon is defined as the average time an atom of carbon will stay in the ocean). ...

This is called the "reservoir effect" and it can be calibrated to obtain corrected results as well:

http://www.c14dating.com/corr.html

quote:
Reservoir effects

Radiocarbon samples which obtain their carbon from a different source (or reservoir) than atmospheric carbon may yield what is termed apparent ages. A shellfish alive today in a lake within a limestone catchment, for instance, will yield a radiocarbon date which is excessively old. The reason for this anomaly is that the limestone, which is weathered and dissolved into bicarbonate, has no radioactive carbon. Thus, it dilutes the activity of the lake meaning that the radioactivity is depleted in comparison to 14C activity elsewhere. The lake, in this case, has a different radiocarbon reservoir than that of the majority of the radiocarbon in the biosphere and therefore an accurate radiocarbon age requires that a correction be made to account for it.

One of the most commonly referenced reservoir effects concerns the ocean. The average difference between a radiocarbon date of a terrestrial sample such as a tree, and a shell from the marine environment is about 400 radiocarbon years (see Stuiver and Braziunas, 1993). This apparent age of oceanic water is caused both by the delay in exchange rates between atmospheric CO2 and ocean bicarbonate, and the dilution effect caused by the mixing of surface waters with upwelled deep waters which are very old (Mangerud 1972). A reservoir correction must therefore be made to any conventional shell dates to account for this difference. Reservoir corrections for the world oceans can be found at the Marine Reservoir Correction Database, a searchable database online at Queen's University, Belfast and the University of Washington. Human bone may be a problematic medium for dating in some instances due to human consumption of fish, whose C14 label will reflect the ocean reservoir. In such a case, it is very difficult to ascertain the precise reservoir difference and hence apply a correction to the measured radiocarbon age.


I have referred to this site before in answer to a creationist claim(1) about dating a modern seal at McMurdo Sound (Antarctica) with an apparent age in thousands of years. Looking up the area in question gave me a reservoir effect that brought the seal age back into modern times with proper calibration.

Although the radiocarbon dates agree closely with dendrochronology, they do not agree exactly.

The corrected dates are generally older than the uncorrected dates. A calibration curve from dendrochronology is (2):

14C is an unstable isotope of carbon, and so decays back to 14N via beta decay with a half-life of about 5730 years. Because the quantity of 14C being produced annually is more or less constant, whereas the quantity being destroyed is proportional to the quantity that exists, it can be shown that the quantity in the atmosphere at any given time will be more or less constant: the processes of production and decay of 14C produces an equilibrium.

I would say that it tends towards an equilibrium, but oscillates around a stable value due to the variation in production. These variations appear in the calibration curve as the jagged bumps in the dendro data.

Enjoy

(1) - see claim at http://www.talkorigins.org/indexcc/CD/CD011_4.html

(2) - see 14C Calibration and Correlations for more


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 232 by Dr Adequate, posted 12-19-2012 3:05 AM Dr Adequate has not yet responded

Replies to this message:
 Message 235 by Coyote, posted 12-19-2012 10:45 AM RAZD has acknowledged this reply

  
RAZD
Member
Posts: 20028
From: the other end of the sidewalk
Joined: 03-14-2004
Member Rating: 2.9


Message 248 of 293 (688013)
01-18-2013 2:08 PM
Reply to: Message 247 by Dr Adequate
01-18-2013 2:45 AM


Re: Sclerochronology
Well done again Dr Adequate

... When we find approximately 400 days per year in the Devonian period and about 390 in the Carboniferous (see J. Wells, Coral Growth and Geochronometry, Nature, March 1963) then this is in line with the dates put on these periods by radiometric methods. ...

There is additional material on this at Age Correlations and An Old Earth, Version 2 No 1 Message 10

quote:
A few more data may be mentioned: Lophophllidium from the Pennsylvanian (Conemaugh) of western Pennsylvania gave 390 lines per annum, and Caninia from the Pennsylvanian of Texas, 385. These results imply that the number of days a year has decreased with the passage of time since the Devonian, as postulated by astronomers.

I also found this graphic on this website although it was not used in the article:

Original at http://freepages.genealogy.rootsweb.com/...ogy/fig1wells.jpg (3)

This shows the smooth change in the length of days with time. The calculations based on just the astrophysics gives a 400 day/year figure for the Devonian and a 390 day/year figure for the Pennsylvanian, so there is very close accord between the predicted number of days, the measured number of days and the measured age of the fossil corals.

That curve would show a theoretical smoothed out running average days per year, without the spin up spin down effects of the magnetic core (and major earthquakes).

The photograph below shows the clam Arctica islandica, a popular species with sclerochronologists.

It is possible to use these growth patterns to date recent sediments in a manner analogous to dendrochronology. However, there is a more interesting way of using this data, which we shall discuss in the remainder of this article.

We also see similar layering in fossil brachiopods, such as are found on Mt Everest and other locations, showing the length of time that each organism lived. These would also show climate variations, and should be able to be aligned into a Sclerochronology (shell chronology) extending back millions of years ... if some grad student was looking for a research project ...

Enjoy

Edited by RAZD, : i


we are limited in our ability to understand
by our ability to understand
Rebel American Zen Deist
... to learn ... to think ... to live ... to laugh ...
to share.


• • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •

This message is a reply to:
 Message 247 by Dr Adequate, posted 01-18-2013 2:45 AM Dr Adequate has not yet responded

  
1
2Next
Newer Topic | Older Topic
Jump to:


Copyright 2001-2018 by EvC Forum, All Rights Reserved

™ Version 4.0 Beta
Innovative software from Qwixotic © 2019