Mother's Day Quarry: Kimmeridgian, Montana
collected by MOR, CMC 1994-2003

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Stegosauridae
? Stegosaurus sp. Marsh 1877
1 specimen
    = Stegosaurus sp. Marsh 1877
Foster 2003
Reptilia
Diplodocinae indet. Janensch 1929
1483 specimens
"Diplodocus or Barosaurus (not Apatosaurus)"
    = Diplodocidae indet. Marsh 1884
Myers 2003
Diplodocus/Barosaurus
    = Diplodocus sp. Marsh 1878
Storrs et al. 2013
Basicranium CMC VP9724; atlas vertebra CMC VP8058; anterior cervical vertebra CMC VP9134; anterior cervical vertebra CMC VP7124; middle cervical vertebra CMC VP7944; ‘‘double beam’’ chevron CMC VP7753; gastralium CMC VP9135; gastralium CMC VP9137; humeri (CMC VP7746, CMC VP9133); ulna CMC VP8045; radius CMCVP8681; coracoid CMC VP8044; CMC VP8075 skin impression; articulated right pes CMC VP8004
Reptilia - Theropoda
Allosaurus sp. Marsh 1877
12 specimens
teeth
    = Theropoda indet. Marsh 1881
Myers 2003
Reptilia - Theropoda - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969
1 specimen
tooth
Branchiopoda - Lioestheriidae
cf. Lioestheria sp. (Deperet and Mazeran 1912)
Storrs et al. 2013 1 specimen
unclassified
Gymnospermae indet.
Storrs et al. 2013
leaf and other fragments
see common names

Geography
Country:United States State/province:Montana County:Carbon
Coordinates: 45.2° North, 108.8° West (view map)
Paleocoordinates:40.5° North, 52.8° West
Basis of coordinate:estimated from map
Altitude:1280 meters
Geographic resolution:small collection
Time
Period: Jurassic Epoch: Late Jurassic
Stage: Kimmeridgian 10 m.y. bin: Jurassic 5
Key time interval: Kimmeridgian
Age range of interval: 154.8 - 149.2 m.y. ago
Stratigraphy
Formation:Morrison
Local order:top to bottom
Stratigraphic resolution:bed
Stratigraphy comments: "lower half of the Upper Jurassic Morrison Formation, approximately 12 m above the underlying Swift Formation"
Lithology and environment
Primary lithology:massive,fine,pebbly,intraclastic,gray,yellow argillaceous,calcareous sandstone
Includes fossils?Y
Lithology description: "a muddy fine-grained sandstone"; "The bone bed matrix consists of light brown very fine-grained sand and silt-to-clay sized particles. The matrix is composed primarily of quartz grains bound by calcareous cement but also includes trace amounts of feldspar...clay rip-up clasts and sparsely distributed pebbles and carbonate nodules occur as minor components of the bone bed...the MDQ deposit lacks definitive indicators of paleopedogenesis"; "a largely homogenous, massive, muddy, grayish-yellow siltstone approximately 4 m thick"
Environment:crevasse splay
Geology comments: "a levee or overbank deposit"
Taphonomy
Modes of preservation:body,soft parts
Degree of concentration:-bonebed
Size of fossils:macrofossils,mesofossils
Spatial orientation:random
Preservation of anatomical detail:good
Abundance in sediment:common
Associated major elements:many
Disassociated major elements:some
Disassociated minor elements:some
Size sorting:very poor
Fragmentation:occasional
Bioerosion:occasional
Feeding/predation traces:tooth marks
Temporal resolution:snapshot
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:selective quarrying,mechanical,field collection
Reason for describing collection:taxonomic analysis
Collectors:MOR, CMC Collection dates:1994-2003
Collection method comments: discovered by MOR crews, then worked by Cinicinnati Museum Center
Metadata
Also known as:Mothers Day Site, MDQ, MT-1
Database number:69890
Authorizer:M. Carrano, P. Mannion Enterer:M. Carrano, J. Tennant
Modifier:M. Carrano Research group:vertebrate
Created:2007-03-08 14:30:21 Last modified:2023-11-21 16:42:24
Access level:the public Released:2007-03-08 14:30:21
Creative Commons license:CC BY
Reference information

Primary reference:
13281.ETE C. E. Turner and F. Peterson. 1999. Biostratigraphy of dinosaurs in the Upper Jurassic Morrison Formation of the Western Interior, U.S.A. In D. D. Gillette (ed.), Vertebrate Paleontology in Utah, Utah Geological Survey Miscellaneous Publication 99-1:77-114 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

15179ETE J. R. Foster. 2003. Paleoecological analysis of the vertebrate fauna of the Morrison Formation (Upper Jurassic), Rocky Mountain region, U.S.A. New Mexico Museum of Natural History and Science Bulletin 23:1-95 [M. Carrano/M. Carrano]
86556 R. Lei, E. Tschopp, C. Hendrickx, M. J. Wedel, M. A. Norell and D. W. E. Hone. 2023. Bite and tooth marks on sauropod dinosaurs from the Morrison Formation. PeerJ 11:16327:1-34 [M. Carrano/M. Carrano]
23449ETE T. Myers. 2003. Catastrophic mass mortality of a herd of young diplodocid sauropods from the Morrison Formation of Wyoming. Journal of Vertebrate Paleontology 23(3, suppl.):81A [M. Carrano/M. Carrano/M. Carrano]
76658 T. S. Myers and A. R. Fiorillo. 2009. Evidence for gregarious behavior and age segregation in sauropod dinosaurs. Palaeogeography, Palaeoclimatology, Palaeoecology 274:96-104 [M. Carrano/M. Carrano]
25860ETE T. S. Myers and G. W. Storrs. 2007. Taphonomy of the Mother's Day Quarry, Upper Jurassic Morrison Formation, south-central Montana, USA. Palaios 22:651-666 [M. Carrano/M. Carrano]
48382 G. W. Storrs, S. E. Oser, and M. Aull. 2013. Further analysis of a Late Jurassic dinosaur bone-bed from the Morrison Formation of Montana, USA, with a computed three-dimensional reconstruction. Earth and Environmental Science Transactions of the Royal Society of Edinburgh 103:1-16 [P. Mannion/J. Tennant/M. Carrano]