Also known as Maiasaura type, MOR TM-160
Where: Teton County, Montana (47.8° N, 112.3° W: paleocoordinates 55.3° N, 78.0° W)
• coordinate estimated from map
• outcrop-level geographic resolution
When: Two Medicine Formation (Montana Group), Campanian (83.6 - 72.1 Ma)
• approx. 76.7 Ma
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•Foreman et al. 2008: 40Ar/39Ar radioisotopic age data reported for the Two Medicine Formation (Rogers et al., 1993; present study) are consistent with the unit accumulating during most of the Campanian Stage (83.5–70.6 Ma, Gradstein et al., 2004), with deposition definitively commencing prior to 80 Ma and terminating shortly after 74 Ma.
• group of beds-level stratigraphic resolution
Environment/lithology: "floodplain"; paleosol/pedogenic, intraclastic, green mudstone
Size class: macrofossils
Preservation: coprolite
Collected by Brandvold, Trexler, Horner in 1978–
Collection methods: quarrying, surface (float), surface (in situ), mechanical,
• eggshell also present
Primary reference: J. R. Horner and R. Makela. 1979. Nest of juveniles provides evidence of family structure among dinosaurs. Nature 282:296-298 [M. Carrano/M. Carrano/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 26775: authorized by Matthew Carrano, entered by Matthew Carrano on 31.10.2002
Creative Commons license: CC BY (attribution)
Taxonomic list
unclassified | |
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Gastropoda | |
Gastropoda indet. Cuvier 1795 snail | |
Reptilia | |
Maiasaura peeblesorum n. gen. n. sp.
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Tyrannosauridae indet.2 Osborn 1906 tyrannosaurid premaxillary teeth, YPM VPPU 023387, 023469, and 023475; lateral teeth YPM VPPU 023467, 023468, 023470, 024953 (three teeth); YPM VPPU 023466, lateral tooth
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