Flower Mound (SMU Loc. 303) (Cretaceous of the United States)

Where: Denton County, Texas (33.0° N, 97.1° W: paleocoordinates 31.4° N, 61.8° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Conlinoceras tarrantense ammonoid zone, Lewisville Formation (Woodbine Group), Middle Cenomanian (99.6 - 93.5 Ma)

• specimen located 2.75 m above base of section, orig. Arlington Mbr.

• bed-level stratigraphic resolution

Environment/lithology: deltaic; black, gray, carbonaceous mudstone and lithified, pyritic sandstone

• "The stratigraphy...reflects the deltaic deposits characteristic of the Woodbine Formation in North Texas...with the sandstone and mudstone alternation representing a progression from delta-plain toward channel or sandbar systems."
• "The mudstone units are dary gray to black, and are commonly sulfur stained. The units are locally fissile, and gypsum crystals and carbonaceous debris occur in many of the layers, increasing in concentration upsection. The sandstone units are calcite cemented, cross-bedded, medium to fine grained, and lenticular with gray silt lenticles. As with the mudstones, the sandstones are sulfur stained and contain sporadic pyrite modules. Moviung upsection, the sands become more massive and less lenticular with less pyrite and sulfur concentrations. Large, diagenetic gypsum crystals occur in the uppermost layers of the section."

Size class: macrofossils

Preservation: trace

Collection methods: quarrying, surface (float), surface (in situ), chemical,

• Collection was made at one time, but from different levels in the 6-m section. Hadrosaur from 2.75 m above section base, crocodilian from 1 m above this, fish and bivalves at section top. Turtle, archosaur phalanx, and another croc element from unspecific locations in section.

Primary reference: J. J. Head. 1996. A primitive hadrosaur (Dinosauria: Ornithischia) from the Cenomanian of Texas and its implications for hadrosaurian phylogenetic and biogeographic histories. Journal of Vertebrate Paleontology 16(3, suppl.):40A [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 24888: authorized by Matthew Carrano, entered by Matthew Carrano on 22.08.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Reptilia
 Archosauria -
Archosauria indet.
 Ornithischia -
Protohadros byrdi n. gen. n. sp.
Protohadros byrdi n. gen. n. sp. Head 1998 ornithopod
 Loricata -
Crocodylia indet.
Crocodylia indet. crocodilian
 Testudines -
"Chelonia indet." = Testudines
"Chelonia indet." = Testudines Batsch 1788 turtle
Pisces
  -
"Pisces indet." = Osteichthyes
"Pisces indet." = Osteichthyes Huxley 1880 bony fish
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam