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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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- cordillera cantabrica
- cryptoschisma schultzii
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I'm still trying to find an example of a xenomorph for @Rockwood and I ran across this strange scene on my 57 pound rock (yes, we weighed it) from my son's land in Pulaski, TN. I know from what I learned here that the pink part is trepostome bryozoan fossils (I love the coloring, by the way!). It appears to have almost a shell over it, though? And in another place a portion of it is "peeking through" the shell like substance? Is that another type of encrusting bryozoan? If so, would that make this a xenomorph? Thanks! Ramona
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- bryozoan
- trepostome
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I hope this is allowed in the Fossil ID portion of the forum. I have learned so much here that I just want to "give back" for a moment. I am a photographer by trade and I want to share a few photos that show the beauty of bryozoa - trepostome bryozoan fossils in this case (thanks to the help from folks on this forum!) These are not huge and monumental discoveries, but the more I study them, the more I am fascinated by them. The more I learn, the more I NEED to learn. These creatures are beautiful in form, color, and substance. I have no questions in this post - just wanted to say THANKS in the way I know best - through my photographs! These are macro photographs - up close and personal with a very large, bryozoan loaded rock from Pulaski, TN. I am not reducing the resolution as much this time, so this will take a few posts. Blessings! Ramona