Morris km (2 Ergebnisse)

PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000.

Three novel features are described in steinkerns of Hypomphalocirrus rugosus Linsley from the Middle Devonian Rogers City Limestone of Michigan. The first feature is located about one-half a volution adapertural of the terminal septum. It has the appearance of a typical molluscan muscle attachment scar and is interpreted as such. The two other features are more enigmatic. They have a less stereotyped appearance and location. The first is interpreted as a field of mantle point-attachments and the other as a product of partial shell dissolution. Comparisons with extant and fossil molluscs confirm that the two features ascribed to biologic origins are within the scope of molluscan soft-part and shell attachment morphologies. 12 pp., 11 figs, 4.…