Holaster simplex Shumard, 1853

Remarks

• Collector:     Keith Minor

• Formation:   Washita Group, Weno Formation

• Location:      Tarrant County, TX

• Dimensions:  lt = 40 mm, wdt = 36 (widest part), ht = 23 mm

General Info

Synonyms (older names and misidentifications in the literature)

• 1853 Holaster simplex Shumard

• 1858 Holaster comanchesi Marcou

• 1858 Holaster simplex Shumard; Desor

• 1858 Holaster comanchesi Marcou; Desor

• 1859 Holaster simplex Shumard; Gabb

• 1859 Holaster comanchesi Marcou; Desor

• 1864 Holaster simplex Shumard; Meek

• 1891 Holaster simplex Shumard; Clark

• 1893 Holaster simplex Shumard; Clark

• 1893 Holaster completus Cragin

• 1893 Holaster nanus Cragin

• 1893 Holaster simplex Shumard; Cragin

• 1893 Holaster supernus Cragin

• 1894 Holaster completus Cragin; Cragin

• 1894 Holaster nanus Cragin; Cragin

• 1889 Holaster simplex Shumard; Hill

• 1915 Holaster simplex Shumard; Clark

• 1919 Holaster simplex Shumard; Adkins & Winton

• 1920 Holaster simplex Shumard; Winton & Adkins

• 1927 Holaster simplex Shumard; Lambert

• 1928 Holaster simplex Shumard; Adkins

• 1947 Holaster simplex Shumard; Shimer & Shrock

• 1987 Holaster simplex Shumard; Akers & Akers

• 1989 Holaster simplex Shumard; Finsley

Stratigraphic Occurrence

• Upper Washita Group, Weno Formation of North Texas

• Lower Washita Group, Fort Worth Formation of North Texas

• Lower Washita Group, Upper Marl Member of the Duck Creek Formation of North Texas

• Lower Washita Group, Boracho Formation of Trans–Pecos Texas

Age

• Holaster simplex Shumard ranges from the Mortoniceras equidistans (Cragin) zone to about the Mortoniceras  (Angolaites) drakei  (Young) zone (?) of Young, lower Upper Albian Stage to Upper Albian Stage (~101–98 mya).

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

• Bryan County, OK

• Grayson County, TX

• Tarrant County, TX

• Trans–Pecos TX (no county given)

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, 85–86, plate XXXXIV, figs 3a–b, plate XXXVIII, figs     1a–j, and plate XXXIX, figs 1a–g.