Journal
RIVISTA ITALIANA DI PALEONTOLOGIA E STRATIGRAFIA
Volume 110, Issue 1, Pages 61-68Publisher
UNIV STUDI MILANO
DOI: 10.13130/2039-4942/6264
Keywords
Jurassic; ammonites; biochronology; coccoliths; U-Pb geochronology; strontium isotopes; zircons; Fernie Formation; Alberta; Bajocian
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The lower and middle parts of the Fernie Formation in central-western Alberta and south-eastern British Columbia, ranging from Pliensbachian to ?Bathonian (Early to Middle Jurassic) in age, and consisting mainly of fossiliferous dark shales and black limestones, contain bentonitic clay horizons which have yielded radiometric ages using U-Pb analysis of zircon crystals. Here we report six new ages from the lowermost Red Deer Member (188.3 + 1.5/-1 Ma); Highwood Member (ca. 173 Ma and 166.6 +/- 0.2 Ma); and Grey Beds (167.0 +/- 0.2 Ma, 165.6 +/- 0.3 Ma, and 165.4 +/- 0.3 Ma). Some of these bentonites are associated with ammonites and coccoliths which provide biostratigraphic constraints. Strontium, carbon and oxygen isotopes measured from belemnite rostra have beer, compared in two sections and the resulting curves are compared with those from western Europe.
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