Fossil collecting in Fenton, MO, October 2008

Steve Hill and his friend Dan May had a great time in October visiting the
Mississippian Warsaw formation at Fenton, Missouri. While time was limited,
a few nice specimens were found, including three crinoids, one blastoid, and
the snail Platyceras pictured here. I always have a great time fossil collecting !

Click on pictures to Magnify

Steven Hill


Synbathocrinus swallovi (Hall)


Macrocrinus sp.


Macrocrinus sp.


Agaricocrinus sp.

4B
Agaricocrinus sp.


Metablastus wortheni - (blastoid)


Platyceras sp.

If anyone is able to help with the identifications of any of these,
I sure would appreciate it !

Steven Hill
You can respond to me at: srhill50@msn.com

Discussion

The long skinny crinoid (#2) is Synbathocrinus swallovi (Hall).
The other is a camerate with the anal tube (#3) ... Dizygocrinus or Batocrinus
is a possible genus, but I'm not sure.
Alan

Alan is correct that the long skinny crinoid is a Synbathocrius. The Camerate crinoid
is a Macrocrinus, probably mundelus. Batocrinus is a old genus name no longer used
except for the type species, I believe.
Chris

The crinoid is an Agaricocrinus of some species. I agree that the blastoid is a Metablastus.
However I think it is M. wortheni. There are a couple of Metablastus found in the Warsaw,
but M. lineatus, I think, is restricted to the Burlington. Metablastus wortheni was originally
named by Hall in 1858 as Pentremites wortheni. I have seen Metablastus bipyramidalis from
the Keokuk Formation and the Somerset Shale. They seem to have a much shorter and
wider pelvis than M. wortheni. I believe that the basal plates of your specimen have been
broken off so that the overall appearance of the blastoid is wide and short as opposed to
long and acutely triangular. Does that make any sense? I'm not sure that even makes sense to me.
Doug

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