Dasciocrinus Crinoid Calyx Fossil

 

Images are of a Dasciocrinus (Kirk, 1939) crinoid calyx fossil. It was found in the Glen Dean Formation of Grayson County, Kentucky USA. The fossil dates to the Mississippian Period. Thanks to Kenny for the images.

Modern Brachiopod Dallinella occidentalis

This picture is of a Dallinella occidentalis (Dall, 1871) modern brachiopod. It was found in Minnesota USA. I cannot find this specimen in their database. USNM PAL 95850 listed as Terebratalia occidentalis (Dall, 1871) is there as a holotype though.

The picture was taken in June 2023 on the first floor of the Smithsonian Museum of Natural History in Washington D.C. USA.

 This brachiopod looks very similar to the Terebratalia transversa (Sowerby, 1846) that I posted about in September 2009.

https://louisvillefossils.blogspot.com/2009/09/modern-day-brachiopod-lacqueas.html

Tylocidaris clavigera Sea Urchin Fossil

Tylocidaris clavigera (Mantell, 1822) cast of a sea urchin fossil found in the Coniacian of the White Chalk subgroup in England.  The creature existed in the Cretaceous Period (Late Turonian to Santonian).  Cast is on display at the Smithsonian National Museum of Natural History as of June 2023.

The genus was named by Pomel in 1883.

I photographed this same specimen in 2010 and posted about it. It is interesting how camera technology as changed. My cell phone picture taken in 2023 is far from perfect. I might start letting it save the RAW images and see how they compare.

https://louisvillefossils.blogspot.com/2010/08/tylocidaris-clavigera.html