genus: Amphoracrinus

© Craven & Pendle Geological Society

Subclass: Camerata
Order: Monobathrida (Camerates without infrabasals)
Family: Amphoracrinidae

Differs from Actinocrinitidae mainly in the much depressed cup with greatly elevated tegmen.  Genera are distinguished by the shape of the cup.  In Amphoracrinus gilbertsoni, the most common species to be found in Clitheroe, it is also one of the more variable with the tegmen being up to two times as tall as the dorsal cup.  Usually it tapers up to a flattish summit.

Amphoracrinus is the predominant crinoid species in my collection. Most of them came out of Bellman Quarry. The calyx's were carefully extracted from a clay-like layer within the limestone beds. The soft sediment presumably helped to prevent crushing of the calyx's. The other surprising aspect was the relatively large number that were preserved intact.

Castle Cement have recently re-opened Bellman Quarry. During the course of 2003 I hope to revisit the site to see what has been uncovered to date.

Interestingly enough, Bellman Quarry is also a good collecting ground for the elusive Blastoid.  Needless to say the blastoid shown on the web site came from Bellman in 1972.

 

Recorded Amphoracrinus
(after Westhead, S.)
Coplow Bellman Salthill Knoll Wood
A. gilbertsoni (Phillips) x x x  
A. gilbertsoni var triangularis x     x
A. atlas (McCoy)   x x  
A. rotundus (Wright) x      
A. bollandensis (Wright) x x    
A. turgidus (Wright)   x x  
A. compressus (Wright)     x x