Crawfordsville Crinoids
(see list below)
Geological Time: Lower Mississippian Osagean Stage (345 m.y.a)
Size (25.4 mm = 1 inch):1. Macrocrinus: 53 mm long by 20 mm wide 2. Eretmocrinus: 35 mm long by 45 mm wide with 15 mm attached stem 3. Scytalocrinus: 40 mm long by 16 mm wide with 16 mm attached stem 4. Agaricocrinus: 35 mm long by 35 mm wide 5. Macrocrinus: 55 mm long by 25 mm wide 6. Camptocrinus: 20 mm long by 10 mm wide 7. Undetermined: 85 mm (curve measure) Matrix: 320 mm maximum width by 165 mm maximum height
Matrix: 320 mm maximum width by 165 mm maximum height
Fossil Site: Crawfordsville Crinoid Site, Indiana
Code: CC303
Price: $995.00
| Description:
There are SEVEN crinoids contained within this single
piece of matrix from Crawfordsville. I have numbered them in
the first image below and to the right to allow you to identify
them wherever possible;
click image to open new window:
Also see: Crawfordsville Crinoids |
used by the Macrocrinus for
excretion of waste, the many preserved pinnules that were used
by the crinoids for filtration of food particles from the water
column, and the extensive cirri present on the stem (#7). Cirri
are used by the crinoid for anchoring to the substrate. Unlike
the cemented holdfast seen in some, cirri would allow the crinoid
to readily detach and move to another site whenever necessary.
Since the calyx is most diagnostic, we have no way of knowing
to which crinoid this one belonged. While I mentioned seven specimens,
there is a partial crinoid to be seen obscured by the calyx of
the Ertemocrinus. This one is yet another Macrocrinus. All in
all, this is a fine representation of the type of preservation
for which the Crawfordsville deposits are world renowned. For
more extensive examples containing TWENTY OR MORE specimens,
see my other offerings.
