Rare Heteromorph from Texas, Mariella (Wintonia) rhacioformis

Description

Ammonoidea, Turrilitidae, Mariella (Wintonia) rhacioformis, Clark, 1965
Many of these misidentified out in the ether. See
Upper Albian and Lower Cenomanian ammonites from the Main Street Limestone, Grayson Marl and Del Rio Clay in northeast Texas.
Kennedy et. al., 2005
Washita Group, Grayson Marl, north Texas
Cretaceous, Lower Cenomanian, mantelli zone 98 Mya
Specimen is 92 mm x 45 mm x 41 mm