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Author Topic:   Growing the Geologic Column
Capt Stormfield
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Posts: 424
From: Vancouver Island
Joined: 01-17-2009


(11)
Message 18 of 740 (733691)
07-20-2014 12:42 PM
Reply to: Message 13 by edge
07-20-2014 4:18 AM


Do you have problems telling maps apart from actual roads?

Well, since you asked, yes. That would seem to be the problem.

By analogy, we have the concept of European history. There is no single book, or tapestry, or painting that records all the details of our activities over the last, say, three thousand years. Yet out of many isolated records, we can assemble a composite that allows us to place those isolated observations in a broader context. If we read all the documents found in the area of an Italian village we would have a record of local births, deaths, mayors, murders, floods, famines, and so on. If we read the history of a French village, the details would be different.

Yet, underlying the vast jumble of different details, there would be the common threads of seasons changing, the rising and falling of Popes and Kings, the waxing and waning of plagues, changing styles in art and technology, and so on. Out of this we could develop a mental image that we call "history" ("the geological column"). And, crucially, we could place seemingly unrelated and quite different small events, that took place in geographically isolated areas, into correct relationships with each other by referencing the larger flow of history around them.

When considering this history, it would be, well, odd to consider an outbreak of typhus in a particular city in France as somehow presenting a challenge to our image of history because it was not recorded in a different city in Italy. To further claim that this occurrence ("intrusion") of typhus ("lava") into the records of the French town was not part of history ("the geological column") would also be odd, to say the least.

What Faith cannot seem to grasp is that her questions and objections about the geological column (read, "the broad, overall history book of the earth") are very much like this. Going on, and on, and on, about a collection of discontinuous geological minutiae is precisely as ridiculous as complaining that the birth records of Luigi's ancestors in San Gimignano don't address the details of Jose's Spanish ancestors in Madrid. Proceeding to then complain that, since neither record can be found in Europe - A History by Norman Davies, history texts are somehow dishonest, is, well, make up your own adjective.

Throughout history, some churches and palaces have burned ("eroded") and local records have been lost. In other places, detailed local histories have been written and preserved, and information is contiguous for generation after generation. None of these local variations and discontinuities change the broad, clear picture of of our history that can be developed by integrating all the information available. The fact that Faith gets hung up on the word "column", and manages to throw sand in her own eyes by conflating the different linguistic connotations and physical implications of this word when used in different contexts, suggests that your comment above goes directly to the point: the map is being crumpled and torn and strewn about in a willful attempt to obscure the road.

ABE: As always, though, the information provided by the more geologically literate is appreciated by the honest learners reading here.

Edited by Capt Stormfield, : No reason given.


This message is a reply to:
 Message 13 by edge, posted 07-20-2014 4:18 AM edge has responded

Replies to this message:
 Message 20 by edge, posted 07-20-2014 3:21 PM Capt Stormfield has acknowledged this reply
 Message 46 by Taq, posted 07-21-2014 11:07 AM Capt Stormfield has not yet responded

  
Capt Stormfield
Member
Posts: 424
From: Vancouver Island
Joined: 01-17-2009


Message 197 of 740 (734220)
07-26-2014 9:58 PM
Reply to: Message 196 by Faith
07-26-2014 8:57 PM


Re: Layer / Sill
I have not yet seen a case of igneous rock as a layer among sedimentary layers that is not a sill.

That's because you apparently just redefine any igneous layers as sills. More than one person has explained how to tell the difference. If a volcano spews lava all over the surrounding countryside, and that countryside subsequently becomes covered with sediment - perhaps because it is in a river valley - how would that qualify as a sill?


This message is a reply to:
 Message 196 by Faith, posted 07-26-2014 8:57 PM Faith has responded

Replies to this message:
 Message 199 by Faith, posted 07-26-2014 10:17 PM Capt Stormfield has responded

  
Capt Stormfield
Member
Posts: 424
From: Vancouver Island
Joined: 01-17-2009


Message 203 of 740 (734227)
07-26-2014 10:38 PM
Reply to: Message 199 by Faith
07-26-2014 10:17 PM


Re: Layer / Sill
How would it qualify as a layer?

How would it not? What do you think a layer is?

Perhaps I'm being nitpicky again but I'm picturing a layer of igneous rock BETWEEN layers of sedimentary rock as what I've never seen unless it's a sill, because as usual I'm thinking of a column, or stack, of layers.

How is that not what I described? Layers of sedimentary rock in a river valley. Volcano sprays lava 10 feet deep all over the valley. River, swamps, rain forests, etc. subsequently bury lava in sediment. Even more sediment crushes this into sedimentary rock. What do you think that would look like in cross section? How would you differentiate this from a sill? Hint: It has to do with the relative temperature of the layers when they interface.

Does such a thing exist or are all these other kinds of examples all there is?

Untranslatable.


This message is a reply to:
 Message 199 by Faith, posted 07-26-2014 10:17 PM Faith has not yet responded

  
Capt Stormfield
Member
Posts: 424
From: Vancouver Island
Joined: 01-17-2009


(3)
Message 206 of 740 (734233)
07-27-2014 12:18 AM
Reply to: Message 204 by Faith
07-26-2014 10:42 PM


Re: dating by magma sills and dikes
What I've been doing is pursuing a few extremely limited arguments.... Mostly I'm interested in what can be seen on diagrams as the basis for my geological arguments....my arguments are about things I think are sufficiently shown on the diagrams.

And therein lies the problem. You are using very oversimplified representations of reality to draw conclusions about a subject that is much broader than your understanding.


This message is a reply to:
 Message 204 by Faith, posted 07-26-2014 10:42 PM Faith has responded

Replies to this message:
 Message 207 by Faith, posted 07-27-2014 12:24 AM Capt Stormfield has responded

  
Capt Stormfield
Member
Posts: 424
From: Vancouver Island
Joined: 01-17-2009


Message 208 of 740 (734235)
07-27-2014 12:37 AM
Reply to: Message 207 by Faith
07-27-2014 12:24 AM


Re: dating by magma sills and dikes
Ooooookay. And why is it again that substituting a narrowly focused study of a map for a broad understanding of the actual territory is going to be a fruitful path to the truth?

This message is a reply to:
 Message 207 by Faith, posted 07-27-2014 12:24 AM Faith has responded

Replies to this message:
 Message 209 by Faith, posted 07-27-2014 1:38 AM Capt Stormfield has not yet responded

  
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