FROM SEQUENCES TO LANDSCAPES: MIDDLE JURASSIC SHIMENGOU FORMATION IN YUKAR

Abstract

The study delves into the sequence stratigraphy of the Shimengou Formation in the Yuqia area, within the backdrop of a continental basin's sedimentary dynamics. Sequences, as intricate sedimentary entities, emerge from the cyclic ebb and flow of relative lake levels, demarcated by sequence unconformity surfaces and corresponding conformity interfaces. Essentially, they represent chronostratigraphic isochronous interfaces. A comprehensive sequence comprises lowstand, transgressive, and highstand system tracts, contingent on the initial and maximum lake flooding surfaces within the sequence. Through employing sequence stratigraphy, this research unveils the lithofacies paleogeography of the Shimengou Formation, offering valuable insights for precise sequence stratigraphic delineation in this locality