Modiolus pedernalis (Roemer, 1849)

Remarks

• Collector:    Keith Minor

• Formation:  Fredericksburg Group, Bee Caves Limestone (= upper Walnut Clay in north Texas)

• Location:     Travis County, Texas

• Note:  the posterior end of the clam is missing (see photo on right).

General Info

Synonyms (older names and misidentifications in the literature)

• 1849 Modiola pedernalis Roemer
• 1852 Modiola pedernalis Roemer; Roemer
• 1928 Modiola pedernalis Roemer; Adkins
• 1960 "Modiolus pedernalis" Roemer; Perkins
• 1969 Modiolus pedernalis (Roemer); Moore
• 2002 Modiolus pedernalis (Roemer); Akers & Akers

Stratigraphic Occurrence

• Fredericksburg Group, Goodland Limestone of north Texas
• Fredericksburg Group, Edwards Limestone of north-central Texas
• Fredericksburg Group, Bee Caves Limestone of south-central Texas

Age

• Modiolus pedernalis (Roemer) ranges from the Middle Albian Stage to the latest Middle Albian or earliest Late Albian Stage (~103-102 mya).

Geographic Occurrence (not an all-inclusive list)

• Gillespie County, TX
• San Saba County, TX
• Tarrant County, TX
• Travis County, TX

Remarks

       For descriptions and photos/figures, see:

• Roemer, F.  1852.  Die Kreidebildungen von Texas und Ihre Organischen Einschlüsse.  Bonn:  Adolph Marcus, 53 and 54, table VII, fig's 11a and b.