Dinopedia - L'encyclopédie des dinosaures

St. Mary River

Description

Source: Wikipédia

The St. Mary River Formation is a geologic formation of Late Cretaceous (71.9-67 Ma) age of the Western Canada Sedimentary Basin in southwestern Alberta and northwesternmost Montana. It was first described from outcrops along the St. Mary River by George Mercer Dawson in 1883, and it takes its name from the river.
Fossils from the formation include remains of dinosaurs, as well as bivalve shells, plant fossils, and trace fossils.

Découvertes

Source: The Paleobiology Database

Site(s) correspondant(s) à cette formation: 20
  • drapeau Canada Scabby Butte, Site 3 : Alberta - ? 2208 2237 13943 42675 78157
  • one of six sites 4.1 km NE of Nobleford in secs 18 and 19, Tp. 11, Rge. 22 on an erosional bench on a westward pomontory near the northeast corner of NE1/4, NW1/4, sec. 18.
  • drapeau États-Unis St. Mary River Formation (Montana) : Montana - Glacier 1822 42675
  • county assignment uncertain
  • drapeau Canada bank of Lethbridge Irrigation Canal : Alberta - ? 9230 14144 29189 61518
  • NE 1/4, sec. 4, T12, R23 W of 4th meridian. Specimen on bank of Lethbridge Irrigation Canal, W of bridge on Alberta Highway 23, 1.5 miles S of Barons, Alberta, Canada. Altitude for Barons. Skeleton from 150 ft W of footprint.
  • drapeau Canada Del Bonita : Alberta - ? 52782
  • Del Bonita; sec 11, T1N, R23W, 4th meridian
  • drapeau Canada Scabby Butte, Site 1 : Alberta - ? 2208 13943 18562 32668 78157
  • About 100 ft. N of the south line, SE1/4, SE1/4, sec. 19; 19 mi S of Little Bow River Pachyrhinosaurus type locality.
  • drapeau Canada Scabby Butte, Site 2 : Alberta - ? 2208 13943 32668 62727 76767 78157
  • On the westerly escarpment in SE1/4, SE1/4, sec. 19
  • drapeau Canada Scabby Butte, Site 5 : Alberta - ? 2208 13943 61518
  • Northwest escarpment in NW1/4, sec.18, about 20 ft below upper prairie level.
  • drapeau Canada Scabby Butte, Site 6 : Alberta - ? 2208 13943 32668 62727
  • This site includes Scabby Butte as a whole. The number is applied to all surface finds.
  • drapeau États-Unis BFD, MOR 609 (PROXY) : Montana - Glacier 14713
  • NW Montana, Glacier Co. - coordinates for St. Mary River
  • drapeau États-Unis 3 miles west of Buffalo Lake : Montana - Glacier 12314 14768 14769 18564 33415 62751
  • 3 mi W of Buffalo Lake, MT, 45 mi W of Sweet Grass, on Blackfeet Indian Reservation
  • drapeau États-Unis Little Rocky Coulee (MOR SM-033) : Montana - Glacier 14768 17718
  • on property of the Hutterite Big Sky colony, Little Rocky Coulee, a few meters from the presumed type site
  • drapeau États-Unis Holy Family Mission (AMNH) : Montana - Glacier 17500
  • 6 mi (9.66 km) above Holy Family Mission, near Browning, MT
  • drapeau Canada Pachyrhinosaurus type, Little Bow River : Alberta - ? 18562 18575 32668 52782 62727
  • near center of SW 1/4, sec 24, T14, R23, W 4th meridian; on N side of Little Bow River, 50 ft above river; E of Carmongay; second specimen from 300 yds SW of type
  • drapeau Canada Lethbridge egg site : Alberta - ? 14221
  • near Lethbridge
  • drapeau Canada Cardston hadrosaur site : Alberta - ? 24165
  • near Cardston
  • drapeau Canada Scabby Butte : Alberta - ? 2208 25123 52721 62727 78202
  • from Scabby Butte, NE of Fort McLeod, about 3 mi E of Nobleford
  • drapeau États-Unis Shell Hell (MOR Loc. 703) : Montana - Glacier 32794
  • MOR locality 703, "in the SW 1/4 Section 19, Township 31 North, Range 9 West...in Glacier County, northwestern Montana. The locality is along the southern bank of the Two Medicine River approximately 16 km (10 miles) southeast of Browning on the Blackfeet Indian Reservation"
  • drapeau Canada St. Mary River tracksite : Alberta - Cardston 17313 54846 68758 70703 77956
  • along the St. Mary River, 20 km SSW of Lethbridge; T5-T6, R23, W 4th meridian
  • drapeau Canada Maycroft tracksite : Alberta - Lethbridge 54846 70703
  • along Oldman River at Maycroft, approx. T10, R2, W 5th meridian
  • drapeau Canada Waldron Flats : Alberta - ? 64543
  • The holotype was recovered from Upper Cretaceous rocks along the Oldman River in the area of Waldron Flats, approximately 164 km south of Calgary, Alberta, Canada (Figure 1). The uppermost St. Mary River Formation and lowermost Willow Creek Formation are both exposed along the river in this area. Due to the strongly upthrust and faulted condition of the bedrock strata in the area and the absence of obvious outcrops of the Battle Formation and Whitemud Member marker beds in the quarry area, it has been difficult to determine the precise stratigraphic position of the specimen in relation to the contact between the St. Mary River and Willow Creek formations. Nonetheless, existing geologic maps of the area suggest that the quarry occurs within the upper 30 m of the St. Mary River Formation [9]. This stratigraphic position is supported by the presence of the angiosperm palynomorph Scollardia trapaformis (D.R. Braman, personal communication) in the host matrix of TMP 2005.055.0001. S. trapaformis is diagnostic for upper beds of both the St. Mary River Formation and the combined Carbon and Whitemud members of the Horseshoe Canyon Formation (southern and central Alberta) [10, 11]. Carbon Member strata north of Drumheller have yielded the chasmosaurine Eotriceratops xerinsularis [10: Figure 3] and are assigned an age of 67.5–68.5 mega-annum (Ma) [10–12]. Given that well-established chronostratigraphic correlations across southern Alberta equate the upper Horseshoe Canyon Formation with the upper St. Mary River Formation (see Figure 9 in [13]), the holotype likely shares this same middle Maastrichtian age.

Publication(s)

La base comprend 37 publication(s).

Source: The Paleobiology Database

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