Parapuzosia (Parapuzosia) americana Scott and Moore, 1928

Remarks

• Collector:    Kevin Durney

• Formation:  Middle Austin Group (uncertain about formation)

• Location:     South-central Texas

Remarks

• Collector:  Keith Minor
• Formation:  Austin Group, top of Atco Limestone
• Location:  Dallas County, TX

General Info

Synonyms (older names and misidentifications in the literature)

• 1928 Parapuzosia americana Scott & Moore

• 1994 Parapuzosia americana Scott & Moore; Emerson et al.

Stratigraphic Occurrence

• Middle Austin Group, formation is uncertain but is from about the level of the Jonah or Dessau Limestone (see below)
• The one to the right came from the top of the Atco Limestone.

Age

• The formation was unknown to Scott and Moore, but they indicated that the holotypes of both P. americana Scott & Moore and P. bosei Scott & Moore were associated with Texanites (Texanites) texanus (Roemer) [as "Mortoniceras texanum Roemer"] and Barroisiceras (Texasia) dentatocarinatum (Roemer) [as"Barroisiceras dentato-carinatum Roemer"].
• T. (T.) texanus (Roemer) is a maker for the Early Santonian, while B. (T.) dentatocarinatum (Roemer) has been reported from the Jonah Formation and base of the Dessau Limestone, Late Santonian to earliest Campanian Stage.
• Our feeling is that P. americana Scott & Moore is of probable Santonian Age.
• The example from Dallas County suggests that P. americana ranges down into the late Coniacian Stage.

Geographic Occurrence (not an all-inclusive list)

• Dallas County, Texas
• South-central Texas

Remarks

       For identification, descriptions and ranges, see:

• Scott, G.; Moore, M. H.  1928.  Ammonites of Enormous Size from the Texas Cretaceous.  Journal of Paleontology 2 (4), 275-278, plate 37, fig's 1–3.

• Young, K.  1963.  Upper Cretaceous Ammonites from the Gulf Coast of the United States.  University of Texas Publication 6304, text-fig's 3 and 4.