Systematic vertical organization of matrix-rich and associated matrix-poor sandstones in ancient deep-marine slope and basin-floor deposits

Deep-marine two -part strata consisting of a sand -rich basal part overlain sharply by a mud -rich upper part have been termed linked debrites, hybrid event beds, transitional flow deposits, and bipartite facies. In continental slope and proximal basin floor strata of the Neoproterozoic Windermere Supergroup (west-ern North America) and distal basin -floor strata of the Ordovician Cloridorme Formation (eastern North America), bipartite facies form the middle of a depo-sitional continuum hundreds of meters long consisting upflow of thick-bedded, matrix -poor sandstone (<20% detrital mud matrix) to thin-bedded, sandy mud -stone (50%-90% mud matrix). This consistent lithofacies change is interpreted to reflect particle settling in a rapidly but systematically evolving, negligibly sheared sand -mud suspension developed along the margins (Windermere) and downflow terminus (Cloridorme) of a high-energy, mud-enriched avulsion jet.In both study areas, beds of similar lithofacies type succeed one another vertically and transform to the next facies in the depositional continuum at about the same along-strike position, forming stratal units two to nine beds thick whose grain -size distribution gradually decreases upward. This spatial and temporal regularity is interpreted to be caused by multiple surges of a single, progressively waning turbidity current, with sufficient lag between suc-cessive surges for the deposition of a traction -structured sandstone overlain by mudstone cap. Furthermore, the systematic back-stepping or side-stepping recognized at the stratal unit scale is interpreted to have been driven by a combi-nation of knickpoint migration and local topographic steering of the flows, which continued until the supply of mud from local seafloor erosion became exhausted, the main channel avulsed elsewhere, or a new stratal element developed.

Automated summary

This paragraph discusses the formation mechanisms of two types of sedimentary rock layers, namely a sand-rich basal part and a mud-rich upper part. This composition is termed "linked debrites" and plays an important role in deposition processes in specific geological regions.