Isocrinus annulatus (Roemer, 1836)

Remarks

• Collector:     Dan Woehr

• Formation:   Trinity Group, Glen Rose Formation

• Location:      Comal County, Texas

General Info

Synonyms (older names and misidentifications in the literature)

• 1836 Pentacrinites annulatus Roemer

• 1840 Pentacrinites annulatus Roemer; Roemer

• 1850 Pentacrinites annulatus Roemer; d'Orbigny

• 1852 Pentacrinites annulatus Roemer; Quenstedt

• 1855 Does not = Pentacrinus annulatus (Roemer); Giebel

• 1875 Pentacrinus annulatus (Roemer); Quenstedt

• 1885 Pentacrinus annulatus (Roemer); Quenstedt

• 1904 Pentacrinus alternans Loriol

• 1961 Isocrinus annulatus (Roemer); Rasmussen

Stratigraphic Occurrence

• Trinity Group, Glen Rose Limestone of south-central Texas

• Late Neocomian rocks of Germany

Age

• Isocrinus annulatus (Roemer) ranges from the Hauterivian Stage to the Early Albian Stage (~126-112 mya).

Geographic Occurrence (by no means an all-inclusive list)

• Comal County, Texas

• Germany

Remarks

         For identification and descriptions, see:

• Rasmussen, H. W.  1961.  A Monograph of the Cretaceous Crinoidea.  Biologiske Skrifter udgivet af det Kongelige Danske Videnskabernes Selskab 12(1), 88-89; plate 9, fig's 5-10.