January 2018 Invertebrate / Plant Fossil Of The Month Poll

[Cris]

Check the entries below carefully and cast your vote! PM me if you notice any errors with the entries.

The poll ends Feb. 6th. Be sure to vote in our other FOTM poll, HERE.  

 

1. Asphinctites Tenuiplicatus Ammonite - Middle Jurassic - Gnaszyn, Poland

 

2. Productid sp. Brachiopods - Carboniferous - Brown County, Texas

 

3. Crinoid Stem Trace - upper Devonian to lower Carboniferous - NE Oklahoma

 

4. Flexicalymene cf. F. senaria Trilobite - Ordovician Galena Formation, Prosser Member - Fillmore Co., MN

 

5. Aulacopleura pogsoni Trilobite - Early Silurian Cotton Formation - Cotton Hill Quarry near Forbes, NSW Australia

 

6. Inoceramus concentricus Bivalve - Cretaceous - France

 

7. Ecphora Gastropod - Miocene Calvert Formation - Brownies Beach, Calvert County, Maryland, USA

 

8. Heteromorphic Ammonite - Upper Cretaceous Austin Chalk Formation - Ellis County, Texas, USA

 

9. Anomia ephippium Oyster - Late Eocene - The Hague, Netherlands
 

[Heteromorph]

I have done some more research and my specimen actually much more resembles the gracile form of Allocrioceras hazzardi than Smedaliceras durhami. In Texas, A. hazzardi is known from the lower Atco age equivalent A. hazzardi zone of the Boquillas Formation in Brewster County and is quite common in that zone of the formation. I have never heard of A. hazzardi being found in the Austin Chalk, but it doesn't seem that far fetched to me. The A. hazzardi zone of the Boquillas Formation is Lower Coniacian in age while my specimen is Upper Coniacian in age, so mine would be a bit younger than the specimens that I have seen. I still have to hear back from Keith Minor, so we shall see.

 

All the specimens this month are great, especially the trilobites! 

[caldigger]

Good luck to all the spineless entries!

[MeargleSchmeargl]

Neat stuff to lose some fingers to the cold for!