and echinoderms plates; microfacies 3 is an oncolytic rudstone consisting of microbes and abundant echinoderms plates; and microfacies
4 is a packstone-grainstone with abundant ooids, trilobite fragments, and echinoderm plates. Two biofacies were identified: Agnostidpolymeroid
biofacies with predominance of the trilobites Pentagnostus, Bathyuriscus, Oryctocephalites, and Elrathina; and Pagetia biofacies with abundant trilobites of the genera Pentagnostus, Pagetia and Elrathina. It is concluded by the sedimentation model that changes in sea level is the most important parameter in determining the siliciclastic microfacies, carbonate microfacies and biofacies;
as well as the depositional environments that vary from the coastline (subtidal to supratidal) to shallow-water open circulation marine
platform with low and high energy waters. The Cambrian deposits of northern Mexico are correlated with the deposits of California and
Nevada (USA), as well as to the Precordillera (Argentina), where the species in common show a strong affinity.
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|Published - 15 Apr 2021