Chronostratigraphy and terrestrial palaeoclimatology of Berriasian–Hauterivian Strata of the Cedar Mountain Formation, Utah, USA
Posted on 2019-10-14 - 12:46
This paper presents breakthroughs in the chronostratigraphy of the heretofore poorly-constrained Yellow Cat Member of the Cedar Mountain Formation, which is an important record of terrestrial environments, ecosystems, and global change in the ancient North American Cordilleran foreland. Zircon populations from ten stratigraphic horizons in the Yellow Cat Member yield youngest single grain ages ranging from 142.5±2.7 Ma to 133.7±2.7 Ma (Berriasian–late Valanginian); those from one mudstone palaeosol yield a robust Concordia Age of 136.3±1.3 (Valanginian). Additionally, a new palynoflora—one of a few to be published from the Cedar Mountain Formation—is assigned to the middle Berriasian to early Hauterivian stages, based on the presence of Foraminisporis wonthaggiensis and Trilobosporites sp. cf. T. canadensis, and the absence of F. asymmetricus, Appendicisporites spp. and angiosperms. Furthermore, these chronostratigraphic data allow us to interpret part of the so-called "Weissert Event" C-isotope excursion (Valanginian) in a new C-isotope profile through a palaeosol-bearing alluvial succession in the Yellow Cat Member. This research extends a firm understanding of the formation further back into the Early Cretaceous than was the case previously and sets the stage for future advancements.
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Joeckel, R. M.; Ludvigson, G. A.; Möller, A.; Hotton, C. L.; Suarez, M. B.; Suarez, C. A.; et al. (2019). Chronostratigraphy and terrestrial palaeoclimatology of Berriasian–Hauterivian Strata of the Cedar Mountain Formation, Utah, USA. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4697138.v1
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AUTHORS (9)
RJ
R. M. Joeckel
GL
G. A. Ludvigson
AM
A. Möller
CH
C. L. Hotton
MS
M. B. Suarez
CS
C. A. Suarez
BS
B. Sames
JK
J. I. Kirkland
BH
B. Hendrix
CATEGORIES
KEYWORDS
middle Berriasianstratigraphic horizonsConcordia AgeHauterivian stagesWeissert EventYellow Cat MemberCedar Mountain Formationpoorly-constrained Yellow Cat MemberC-isotope excursionMaC-isotope profilefuture advancementsForaminisporis wonthaggiensisValanginianTrilobosporites spmudstone palaeosolfirm understandingAppendicisporites sppUSANorth American Cordilleran forelandchronostratigraphic datagrain agesZircon populationsGeology