Palhemiaster calvini (Clark, 1893)

Remarks

• Collector:      Lee Duchouquette

• Formation:    Upper Washita Group, Grayson Formation

• Location:       Denton County, TX.

• Dimensions:  l = 22 mm, w = 20 mm (widest part), h = 18 mm (tallest part)

• We would like to thank Scott Kelley for the name revision.

General Info

Synonyms (older names and misidentifications in the literature)

• 1893 Hemiaster calvini Clark

• 1910 Hemiaster calvini Clark; Böse

• 1915 Hemiaster calvini Clark; Clark

• 1916 Hemiaster calvini Clark; Whitney

• 1920 Hemiaster calvini Clark; Adkins

• 1927 Hemiaster calvini Clark; Lambert

• 1928 Hemiaster calvini Clark; Böse

• 1928 Hemiaster calvini Clark; Adkins

• 1947 Hemiaster calvini Clark; Shimer & Shrock

• 1987 Hemiaster calvini Clark; Akers & Akers

• 1989 Hemiaster calvini Clark; Finsley

Stratigraphic Occurrence

• Uppermost Washita Grp, Buda Fm of north & central TX

• Upper Washita Grp, Del Rio Fm of central Texas

• Upper Washita Grp, Grayson Fm of north Texas

• Upper Washita Grp, Mainstreet Fm of North Texas

• Upper Washita Grp, Pawpaw Fm of North Texas

• Upper Washita Grp, Weno Fm of North Texas

Age

• Palhemiaster calvini (Clark) ranges from the Mortoniceras (Angolaites) drakei (Young) zone to the Budaiceras hyatti (Shattuck) zone, Upper Albian Stage to upper Lower Cenomanian Stage (~98–96 mya).

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

• Denton County, TX

• El Paso County, TX

• Grayson County, TX

• Tarrant County, TX

• Travis County, TX

Remarks

         For identification and descriptions, see:

• Clark, W. B.; Twitchell, M. W.  1915.  Mesozoic and Cenozoic Echinodermata of the United States.  United States Geological Survey Monograph 54, 91 and plate XLVII, figs 2a–2i.