Uppermost Silurian-Lowermost Devonian, North Africa
for more information on the float-bearing African crinoid see the article:
Prokop, R. J. - Petr, V. (1987): Marhoumacrinus
legrandi, gen. et sp. n. (Crinoidea, Camerata) from Upper Silurian
- Lowermost Devonian of Algeria. - Sborník Národního
muzea, ř. B, 43(1): 1-14. Praha.
