Amphoracrinus sp. (either A. gilbertsoni or A. gigas)
Matrix free beautifully preserved calyx. Lovely detail of the individual plates under magnification. Bases of all 5 arms showing. Salthill Quarry in the past produced some amazing Crinoid material. Now an SSSI Geological Nature Trail. Difficult to obtain these lovely Crinoid Heads collected back in the 1960's and 1970's.
Lower Carboniferous, Visean..
Salthill Quarry, Clitheroe, Lancashire.
Calyx : 4.2 cm tall.