What is it? (Fossils, rocks and geology)

I recently went to a bunch of yard sales, and I picked up someone's rock collection. Their hobby was going all over the U.S. and picking up interesting things. Since his kids were going back to utah the next morning, they didn't want to haul around a bunch of rocks.Can someone tell me what some of these are?For example, what kind of tooth is this? And this looks like a paw print.. It is, or is it just a random set of depressions that evoke invalid conclusions? and what kind of nut would this possibly be (it's rock, but looks similar to a shag bark hickory nut)

1 is not a tooth. I think it is a belemnite shell. Correction - Not a shell, but actually an internal hard part called a "guard".Don't know about 2.3 looks like a barnacle shell to me.MooseEdited by Minnemooseus, : Correction.

Darn. A tooth would be much more romantic. .. but having those two marine fossils makes sense.

It would be better to have the rock in hand, but via photo it looks like you have a slab of rock that has a weathered surface (the lighter color). The darker areas are just where the weathered rock has been chipped or worn off.That's my best guess.MooseEdited by Minnemooseus, : Typo, and didn't bother using preview.

I suspected that, but hope springs eternal. I didn't see any claw marks..

I also thought of a barnacle for that last one.

Belemnite trivia of sorts (nod to Carbon Coyote, who may know about this).

quote:

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In geochemistry, paleoclimatology and paleoceanography δ¹³C is an isotopic signature, a measure of the ratio of stable isotopes ¹³C : ¹²C, reported in parts per thousand (per mil, ).[1]

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and

quote:

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The standard established for carbon-13 work was the Pee Dee Belemnite (PDB) and was based on a Cretaceous marine fossil, Belemnitella americana, which was from the Pee Dee Formation in South Carolina. This material had an anomalously high ¹³C:¹²C ratio (0.0112372), and was established as δ¹³C value of zero. Use of this standard gives most natural material a negative δ¹³C.[2] The standards are used for verifying the accuracy of mass spectroscopy; as isotope studies became more common, the demand for the standard exhausted the supply. Other standards, including one known as VPDB (for "Vienna PDB") have replaced the original.[3]

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SourceDamn, it sounds like they used up all the Pee Dee Belemnites.Moose