Fluvial interpretations of stratigraphic surfaces across Upper Triassic to Lower-Middle Jurassic continental red beds northeastern Mexico

This work broadens the understanding of previous interpretations from Late Triassic-Early-Middle Jurassic reds beds in northeastern Mexico Huizachal Group. Proposed bounding surfaces El Alamar, La Boca, and Joya formations are informal. The here assigned allostratigraphic hierarchies for genetic interpretations. continental provide no sea-level markers to tie marine base level, but these fluvial-alluvial environments produce various scales traceable scour surfaces. Upper Triassic-Middle sandstones were analyzed at ten localities. Sedimentary profiles details two facies associations main facies, which share 20 sedimentary lithofacies. documentation fluvial architecture considers structures paleocurrents sand bodies features five styles driving depositional system, including mixed debris flow braided river systems, gravelly or sandy meandering river, ephemeral sand-bed sheet-flood distal river. model provides greater detail more accurate stratigraphic correlation conditions under rocks deposited, as it allows identifying four major that can be tied processes amalgamation, aggradation, degradation, flooding. exercise estimates provisional regional tracts deposits with apparent impact by level. Amalgamation underneath laterally extensive sheets amalgamated channel-belt architectural elements, contacts underlying disconformable, locally angular unconformities. also include sediment-gravity flows deposited such channelized flows. Aggradation underlies binds volcaniclastic common mass wasting creep flows, well overland gullying over broad alluvial plains forming upward-coarsening sequences. It records rapid burial landscapes wasting, distinguishing typical valleys cut normal channel processes. Degradation incised confine channels floodplains, unconformably overly fining-upward Flooding marks sediment accumulation formed overbank low-energy environments.