Alameda Parkway tracksite: Albian - Early Cenomanian, Colorado
collected by Markman, Lockley 1938-1990

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Iguanodontipodidae
Lockley 1986 57 specimens
Lockley 1987
Reptilia - Avetheropoda
MacKenzie 1968
tridactyl tracks
Lockley 1986
Lockley 1987
Reptilia - Ornithomimipodidae
Lockley 1986 19 individuals
Lockley 1987
Matthews and Breithaupt 2001
Lockley et al. 2001
Reptilia - Crocodilia
Lockley et al. 2006 1 specimen
unclassified
Thalassinoides sp. Ehrenberg 1944
Chamberlain 1976
see common names

Geography
Country:United States State/province:Colorado County:Jefferson
Coordinates: 39.7° North, 105.2° West (view map)
Paleocoordinates:46.1° North, 59.5° West (Wright 2013)
Basis of coordinate:estimated from map
Geographic resolution:outcrop
Time
Period: Cretaceous Epoch: Early Cretaceous - Late Cretaceous
Stage: Albian - Cenomanian 10 m.y. bin: Cretaceous 4 - Cretaceous 5
Key time interval: Albian - Early Cenomanian
Age range of interval: 113.2 - 93.9 m.y. ago
Stratigraphy
Geological group:Dakota Formation:Muddy Sandstone
Stratigraphic resolution:group of beds
Stratigraphy comments: 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
Lithology and environment
Primary lithology:paleosol/pedogenic sandstone
Secondary lithology:coarse siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "Bed "X" is a coarse siltstone with at least three different sets of footprints." Tracks in beds X, Z.
Environment:estuary/bay
Glacial or sequence phase:transgressive
Geology comments: tidal flat; "[strata] evidently represent onlap of coastal deposits and backfilling of valleys during transgression."
Taphonomy
Modes of preservation:cast,mold/impression,trace
Size of fossils:macrofossils
Spatial orientation:life position
Associated major elements:some
Temporal resolution:snapshot
Spatial resolution:autochthonous
Collection methods and comments
Collection methods:surface (in situ),peel or thin section,observed (not collected)
Reason for describing collection:paleoecologic analysis
Collectors:Markman, Lockley Collection dates:1938-1990
Collection method comments: Original discovery in 1938 followed by renewed excavation in 1990s by Lockley et al.
Metadata
Also known as:Main Dinosaur Ridge Tracksite, Stop 12
Database number:66900
Authorizer:M. Carrano Enterer:M. Carrano, S. Miller
Modifier:M. Carrano Research group:vertebrate
Created:2006-10-23 08:40:00 Last modified:2025-02-22 15:12:02
Access level:the public Released:2006-10-23 08:40:00
Creative Commons license:CC0
Reference information

Primary reference:
78014. 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]

Secondary references:

69025 L. Alcalá, M. G. Lockley, A. Cobos, L. Mampel, and R. Royo-Torres. 2016. Evaluating the dinosaur track record: an integrative approach to understanding the regional and global distribution, scientific importance, preservation, and management of tracksites. In P. L. Falkingham, D. Marty, & A. Richter (eds.), Dinosaur Tracks: The Next Steps 100-116 [M. Carrano/M. Carrano]
77732 B. H. Breithaupt, N. A. Matthews, and T. A. Noble. 2004. An integrated approach to three-dimensional data collection at dinosaur tracksites in the Rocky Mountain West. Ichnos 11:11-26 [M. Carrano/M. Carrano]
65033 C. K. Chamberlain. 1976. Field guide to the trace fossils of the Cretaceous Dakota hogback along Alameda Avenue, west of Denver, Colorado. In C. K. Chamberlain & R. W. Frey (ed.), Seminar on Trace Fossils. United States Geological Survey Short Course Syllabus 37-42 [M. Carrano/M. Carrano]
54846 P. J. Currie, G. C. Nadon, and M. G. Lockley. 1991. Dinosaur footprints with skin impressions from the Cretaceous of Alberta and Colorado. Canadian Journal of Earth Sciences 28:102-115 [M. Carrano/M. Carrano/M. Carrano]
68758 I. Díaz-Martínez, X. Pereda-Suberbiola, F. Pérez-Lorente and J. I. Canudo. 2015. Ichnotaxonomic review of large ornithopod dinosaur tracks: temporal and geographic implications. PLoS 10(2):e0115477:1-50 [M. Carrano/M. Carrano]
69370 J. O. Farlow. 1987. A Guide to Lower Cretaceous Footprints and Tracksites of the Paluxy River Valley, Somervell County, Texas. South-Central Geological Society of America Guidebook 50-A-20 [M. Carrano/M. Carrano]
65404 J. R. Foster and M. G. Lockley. 2006. The vertebrate ichnological record of the Morrison Formation (Upper Jurassic, North America). In J. R. Foster, S. G. Lucas (eds.), Paleontology and Geology of the Upper Jurassic Morrison Formation. New Mexico Museum of Natural History and Science Bulletin 36:203-216 [M. Carrano/M. Carrano]
64679 M. G. Lockley. 1984. Some historic and geologic observations on the Alameda road cut. Geology Department Magazine, University of Colorado Denver 3:15-17 [M. Carrano/M. Carrano]
63566 M. G. Lockley. 1986. A Guide to Dinosaur Tracksites of the Colorado Plateau and American Southwest. University of Colorado at Denver Geology Department Magazine, Special Issue 1:1-56 [M. Carrano/M. Carrano/M. Carrano]
19038ETE M. G. Lockley. 1987. Dinosaur footprints from the Dakota Group of eastern Colorado. The Mountain Geologist 24(4):107-122 [M. Carrano/M. Carrano]
59735% 15000M. G. Lockley. 1994. Dinosaur ontogeny and population structure: Interpretations and speculation based on fossil footprints . In K. Carpenter, K. F. Hirsch, J. R. Horner (eds.), Dinosaur eggs and babies 347-365 [M. Carrano/M. Carrano/M. Uhen]
19047ETE M. G. Lockley. 2001. A decade of dinosaur tracking at Dinosaur Ridge. The Mountain Geologist 38(3):119-135 [M. Carrano/M. Carrano]
25992ETE M. G. Lockley, J. Holbrook, R. Kukihara and M. Matsukawa. 2006. An ankylosaur-dominated dinosaur tracksite in the Cretaceous Dakota Group of Colorado: paleoenvironmental and sequence stratigraphic context. In S. G. Lucas and R. M. Sullivan (eds.), Late Cretaceous Vertebrates from the Western Interior. New Mexico Museum of Natural History and Science Bulletin 35:95-104 [M. Carrano/M. Carrano]
19046ETE,5% 53960M. G. Lockley, N. Hook, and A. Taylor. 2001. A brief history of paleontological research and public education on Dinosaur Ridge. The Mountain Geologist 38(3):87-95 [M. Carrano/M. Carrano/J. Alroy]
61886 M. G. Lockley and A. P. Hunt. 1995. Dinosaur Tracks and Other Fossil Footprints of the Western United States xxi-338 [M. Carrano/M. Carrano]
54850 M. G. Lockley, M. Matsukawa, and I. Obata. 1989. Dinosaur tracks and radial cracks: unusual footprint features. Bulletin of the National Science Museum, Tokyo, Series C 15(4):151-160 [M. Carrano/M. Carrano]
85491 M. G. Lockley, B. Simmons, and S. E. Hirschfeld. 2018. A new dinosaur track locality in the Late Cretaceous (Maastrichtian) Laramie Formation of Colorado. In S. G. Lucas & R. M. Sullivan (ed.), Fossil Record 6. New Mexico Museum of Natural History and Science Bulletin 79:395-406 [M. Carrano/M. Carrano]
54567 M. G. Lockley and J. L. Wright. 2001. Trackways of large quadrupedal ornithopods from the Cretaceous: a review. In D. H. Tanke & K. Carpenter (ed.), Mesozoic Vertebrate Life: New Research Inspired by the Paleontology of Philip J. Currie 428-442 [M. Carrano/M. Carrano]
19048ETE M. G. Lockley, J. L. Wright, and M. Matsukawa. 2001. A new look at Magnoavipes and so-called "big bird" tracks from Dinosaur Ridge (Cretaceous, Colorado). The Mountain Geologist 38(3):137-146 [M. Carrano/M. Carrano]
63983 D. B. MacKenzie. 1968. Studies for students: sedimentary features of Alameda Avenue cut, Denver, Colorado. The Mountain Geologist 5(1):3-13 [M. Carrano/M. Carrano]
64075 D. B. MacKenzie. 1972. Tidal sand flat deposits in Lower Cretaceous Dakota Group near Denver, Colorado. The Mountain Geologist 9(2-3):269-277 [M. Carrano/M. Carrano]
14666ETE M. Matsukawa, M. G. Lockley, and A. P. Hunt. 1999. Three age groups of ornithopods inferred from footprints in the mid-Cretaceous Dakota Group, eastern Colorado, North America. Palaeogeography, Palaeoclimatology, Palaeoecology 147:39-51 [M. Carrano/K. Maguire/M. Carrano]
19043ETE N. A. Matthews and B. H. Breithaupt. 2001. Close-range photogrammetric experiments at Dinosaur Ridge. The Mountain Geologist 38(3):147-153 [M. Carrano/M. Carrano]