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Showing results for tags 'cyrtina'.
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The Devonian period is known as "The Age of Fish", but could also be known as "The Age of Brachiopods." In the Early / Lower Devonian, brachiopods reached the height of their diversity towards its end in the Emsian. We see the ancestral groups occurring, lingulids, craniids, orthids, protorthids, pentamerids, rhynchonellids and strophomenids, as well as the later successful groups we have seen before such as atrypids, athyrids and orthotetids, plus the rise of spiriferids, spiriferinids and productids and the beginning of the terebratulids. By the end of the Devonian , several of these groups are extinct or severely reduced in importance and brachiopods never quite recover. Also, the Devonian is the last time we see trilobites with such variation, large sizes and numbers and orthocerids too are much more uncommon after the rise of the goniatites. The massive tabulate coral reefs also disappear after the Devonian. Fascinating period and I hope to share some of its wonders with you. Equally, a lot of this is rather new to me, so I would be very grateful for any assistance, corrections or further information on my specimens. Thank you. The Early Devonian epoch is split into three stages, so let's start with the first of those, the Lochkovian, that began about 419 mya and finished roughly 411 mya. I have been sent a nice selection of brachiopods from the Kalkberg Formation, Helderberg Group by the Mighty @Misha, mostly. But the kind gentleperson also sent me this fascinating little bryozoan hash : It is dominated by fenestellids, which is usually the case in the Devonian, but other orders sill occur. These ones, I think, are Fenestella, but there are so many species in the formation that I wont take a guess as to species : Not sure what this one is ;
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- aguion formation
- area de bonar
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From the album: Lime Creek Devonian Rockford Iowa
Cyrtina iowaensis uncommon. Easily overlooked due to its tiny size. Only way to tell apart from Tenticospirfier is its coarser ribs. -
Found as surface float on the scree pile at the Windom exposure. Refs: Linsley, D. M. “Devonian Paleontology of New York” (1994). Paleontological Research Institution Special Publication No. 21. Hall, J. Palaeontology of New York v. 4. (1867) Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)
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Found as surface float on the scree pile at the Windom exposure. Possible undescribed species of genus Cyrtina. Closely resembles C. hamiltomensis, but surface is smooth and punctate, rather than covered in tiny spicules. Also differs in that extremities are slightly rounded, rather than squared, and height of interarea is equal to the width rather than smaller. References: Ehlers, G. M. Cyrtina Hamiltonensis (Hall) And A New Species Of This Brachiopod Genus From New York. Contributions From The Museum Of Paleontology The University Of Michigan Vol. XVIII, No. 12, pp. 197-204 (1963). Linsley, D. M. Devonian Paleontology of New York. (1994) Paleontological Research Institution Special Publication 21. Wilson, K. A. Field Guide to the Devonian Fossils of New York. (2014) Paleontological Research Institution Special Publication 44. Hall, J. Palaeontology of New York v. 4. (1867) Fossilworks. http://fossilworks.org Yale Peabody Museum Collections website (http://peabody.yale.edu/collections/invertebrate-paleontology)
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Hungry Hollow Oct 24, 2013 Crinoid Calyx And Other Fun Stuff
lmacfadden posted a topic in Fossil Hunting Trips
Made it to the South Pit of Hungry Hollow today for 3 hours and found a few interesting bits. The most interesting was the crinoid calyx. It's amazing what a little rain will uncover.
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- arthrocanthus
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Awesome Finds This Week Hungry Hollow, 5 Blastoids, 1 Trilobite
lmacfadden posted a topic in Fossil Hunting Trips
Some great finds this week - 4 Blastoids in one day (Aug 4) and 1 on Aug 10. Found my very first one last week. Now I WANT to find them and that seems to be what my eyes focus in on. My OCD (just kidding) wouldn't allow me to go home until I found one on my Aug 10 fossil hunt. And lo' and behold, I did! Found some very cool assorted trilobite bits - I'm a newbie so all pieces of trilobite are intriguing to me, even bums! I can never pass up Cyrtinas, they're awesome! Found the biggest one so far in my collection... I found LOTS of other interesting things that I have multiples of. Some PERFECT brachiopods, large and small (not pictured). Can't leave them behind when they're that pristine. I'm still learning to identify fossils properly. I had the good fortune of having a fossil buddy along with me who is much more knowledgeable and a real gentleman. We braved the cliffs and got out alive. It sure makes for fun fossil foraging! Can't wait to go out again!!! I need a manicure!
