Yacoraite Formation
| Yacoraite Formation | |
|---|---|
| Type | Geological formation |
| Sub-units | Amblayo, Güemes, Alemanía and Juramento Members |
| Underlies | Olmedo Formation, Tunal Formation |
| Overlies | Lecho Formation |
The Yacoraite Formation is a largely Mesozoic geologic formation. The deposits of this formation mainly date from the Maastrichtian of the Upper Cretaceous, but the Cretaceous–Paleogene boundary (K–T boundary) runs right through this formation near its top, and the uppermost parts are consequently from the Danian (Lower Paleocene). It was probably deposited around the intertidal zone, as the sedimentary rocks of this formation alternate according to sea level changes between deposits of muddy beaches and of shallow ocean.[1]
Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.[2]
Well-preserved dinosaur footprints – possibly of Hadrosauridae – have been found in this formation, as were fossil eggs, stromatolites and the Mesozoic palynomorph Aquilapollenites. [1]
See also
Footnotes
References
- Marquillas, Rosa;del Papa, Cecilia; Sabino, Ignacio & Heredia, Jorge (2003): Prospección del límite K/T en la cuenca del Noroeste, Argentina [The K/T boundary prospecting in the Northwest Basin, Argentina]. Revista de la Asociación Geológica Argentina 58(2): 271-274 [Spanish with English abstract].
- Weishampel, David B.; Dodson, Peter & Osmólska, Halszka (eds.) (2004): The Dinosauria (2nd ed.). University of California Press, Berkeley, USA. ISBN 0-520-24209-2