Also known as Main Dinosaur Ridge Tracksite, Stop 12

Where: Jefferson County, Colorado (39.7° N, 105.2° W: paleocoordinates 38.5° N, 64.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Muddy Sandstone Formation (Dakota Group), Albian to Albian (113.0 - 93.5 Ma)

• originally considered upper part of South Platte Fm., now "the middle to upper part" of the Muddy Formation, within Sequence 3; 6 track-bearing levels in total

•

•Sequence 3 generally spans the Albian–Early Cenomanian, see Lockley et al. 1992

• group of beds-level stratigraphic resolution

Environment/lithology: estuary or bay; paleosol/pedogenic sandstone and coarse-grained siltstone

Size class: macrofossils

Preservation: cast, mold/impression, trace

Collected by Markman, Lockley in 1938-1990

Collection methods: surface (in situ), peel or thin section,

• Original discovery in 1938 followed by renewed excavation in 1990s by Lockley et al.

Primary reference: C. M. Boos, T. C. Hiestand, and D. W. Schacht. 1962. Geology of Foothills and Front Range in the Vicinity of Morrison, Colorado. Part One: Guidebook for Field Trip. 1-48 [M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 66900: authorized by Matthew Carrano, entered by Matthew Carrano on 23.10.2006, edited by Steven Miller

Creative Commons license: CC BY (attribution)