Where: Denton County, Texas (33.0° N, 97.2° W: paleocoordinates 31.4° N, 61.9° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Grayson Marl Formation, Early/Lower Cenomanian (99.6 - 93.5 Ma)
• Lower lower Cenomanian
• bed-level stratigraphic resolution
Environment/lithology: lithified marl
Size class: macrofossils
Reposited in the USNM
Primary reference: W. J. Kennedy, W. A. Cobban, J. M. Hancock and W. S. Gale. 2005. Upper Albian and Lower Cenomanian ammonites from the Main Street Limestone, Grayson Marl and Del Rio Clay in northeast Texas. Cretaceous Research 26:349-428 [L. Bulot/L. Bulot/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 175110: authorized by Matthew Clapham, entered by Matthew Clapham on 02.12.2015
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Stoliczkaia (Lamnayella) texana Cragin 1893 ammonite
Stoliczkaia (Stoliczkaia) conlini n. sp. Kennedy 2005 ammonite | |
Sharpeiceras schlueteri Hyatt 1903 ammonite
Graysonites wacoense Böse 1928 ammonite | |
Metengonoceras bravoense Böse 1928 ammonite
Engonoceras retardum Hyatt 1903 ammonite | |
"Mariella (Wintonia) brazoensis" = Mariella (Plesioturrilites) brazoensis, "Mariella (Wintonia) bosquensis" = Mariella (Plesioturrilites) bosquensis, "Mariella (Wintonia) rhacioformis" = Mariella (Plesioturrilites) rhacioformis
"Mariella (Wintonia) brazoensis" = Mariella (Plesioturrilites) brazoensis Roemer 1849 ammonite
"Mariella (Wintonia) bosquensis" = Mariella (Plesioturrilites) bosquensis Adkins 1920 ammonite
"Mariella (Wintonia) rhacioformis" = Mariella (Plesioturrilites) rhacioformis Clark 1965 ammonite |