Mytiloides mytiloidiformis (Tröger, 1967)

Remarks

• Collector:    Prof. Norm King, Univ. of Southern Indiana

• Formation:  Niobrara Group, Basal Fort Hays Limestone

• Location:     Las Animas and Otero Counties, CO

General Info

Synonyms (older names in the literature)

• 1930 Inoceramus inconstans inconstans Woods; Fiege
• 1940 Inoceramus incertus Jimbo; Nagao & Matsumoto
• 1967 Inoceramus fiegei mytiloidiformis Tröger
• 1969 Inoceramus fiegei mytiloidiformis Troger; Jerzykiewicz
• 1977 Does not = Mytiloides fiegei mytiloidiformis (Tröger); Kauffman
• 1978 Does not = Mytiloides fiegei mytiloidiformis (Tröger); Kauffman et al.
• 1979 Does not = Inoceramus fiegei mytiloidiformis Tröger; Ivannikov
• 1983 Mytiloides sp. aff. mytiloidiformis (Tröger); Matsumoto & Noda
• 1984 Mytiloides fiegei mytiloidiformis (Tröger); Cobban
• 1984 Mytiloides sp. aff. M. mytiloidiformis (Tröger); Noda
• 1998 Mytiloides mytiloidiformis (Tröger); Noda & Matsumoto

Stratigraphic Occurrence

• Very Late Turonian rocks of Afghanistan

• Very Late Turonian rocks of England

• Very Late Turonian rocks of Germany

• Very Late Turonian rocks of Japan

• Very Late Turonian rocks of Kazakhstan

• Very Late Turonian rocks of Poland

• Very Late Turonian rocks of Romania

• Very Late Turonian rocks of Russia

• Very Late Turonian rocks of the Ukraine

• Frontier Formation of Wyoming

• Niobrara Group, Basal Fort Hays Limestone of Colorado

• Mancos Shale of New Mexico

Age

• Mytiloides mytiloidiformis (Tröger) occurs in the Mytiloides incertus (Jimbo) zone, very Late Turonian Stage (~ 89 mya).

Geographic Occurrence (not an all-inclusive list)

• Afghanistan

• Carbon County, WY

• Doña Ana County, NM

• England

• Germany

• Japan

• Kazakhstan

• Las Animas County, CO

• Poland

• Romania

• Russia

• Ukraine

Remarks

         For identification, descriptions, and range see:

• Kauffman, E. G.; Sageman, B. B.; Kirkland, J. I.; Elder, W. P.; Harries, P. J.; Villamil, T. 1993.  "Molluscan Biostratigraphy of the Cretaceous Western Interior Basin, North America".  In:  Caldwell, W. G. E.; Kauffman, E. G., eds. Geological Association of Canada Special Paper 39, 414.
• Walaszczyk, I.; Cobban, W. A.  2000.  Inoceramid Faunas and Biostratigraphy of the Upper Turonian-Lower Coniacian of the Western Interior of the United States.  Palaeontological Association, Special Papers in Palaeontology 64, 58−60, plate 10, fig's 1 (plaster cast of Tröger's holotype), 2, and 4; and plate 14, fig's 2−3, 7−8, 10−11, and 13.