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Showing results for tags 'growth'.
Found 9 results
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Free Access pdf link: https://www.tandfonline.com/doi/pdf/10.1080/08912963.2020.1861608?needAccess=true Shimada, K., Bonnan, M. F., Becker, M. A., Griffiths, M. L. (2021). Ontogenetic growth pattern of the extinct megatooth shark Otodus megalodon—implications for its reproductive biology, development, and life expectancy. Historical Biology. Abstract: The extinct megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), is known primarily from its gigantic teeth in the late Neogene marine fossil record. It is known to reach at least 14.1‒15.3 m in length, but its r
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Hello, I picked this up among some gravel, I'm guessing this cold be a belemnite, but am not certain. I noticed it had a strange lump, is anybody able to identify this? Sorry there's no scale, it's about 6-7cm. Thanks.
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Hello, I have many crinoid columnals that I collected in gravel (I suppose it was river/creek gravel collected and sold by a "sand and gravel" company) in Illinois many years ago. I have two questions that may be obvious to more seasoned fossil hunters/students. 1) Exactly how did the crinoids actually grow, meaning, how did the stems' diameter expand horizontally in size as time went on, since the stems were mostly composed of hard calcium carbonate/lime. In other words, it seems that once they are "hardened" or "frozen" into a certain size, how can they get bigger? Was the
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I dug this bone up and it has obvious bone growth beyond the ordinary. It does look as if there is a chunk missing which may have been a bite mark, perhaps during a mating fight or the like since it does not appear to be from a shark bite. Mid. Miocene, Temblor Formation, Bakersfield, California What do you suppose is the cause? This shows a bite out of the bone, but isn't consistent with a shark bite pattern.
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I would love to know what's in this oyster shell? Black pearl?
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Howdy folks! I found the following article on Dr. Thomas Carr's twitter feed this afternoon. It gives a little more insight into the growth stages of the newly described Daspletosaurus. Why do I follow a bunch of paleontologists on twitter? Well, because dentistry is sometimes boring, but paleontology never is! Enjoy! On on a side note, he is working on the "Jane" monograph, so stay tuned! http://tyrannosauroideacentral.blogspot.com/2017/04/introducing-daspletosaurus-horneri-two_3.html?m=1
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a classic http://rstb.royalsocietypublishing.org/content/royptb/264/865/439.full.pdf nb.:LARGE FILE!!!!! AW knew brachs inside and out,and you can take that literally link expires nov.6th
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Found the probably most significant biology text of the previous century. hefty,scholarly.much,much cited NB long/big download* This is one of the first theoretical texts on the geometry and kinematics of growth,according to some still one of the finest https://archive.org/details/ongrowthform00thom *73Mb
