The Carboniferous–Permian strata in the southern Beishan Orogenic Collage (BOC) have been regarded as deposits formed either in a branch of the Paleo-Asian Ocean (PAO) or in continental rift basins. This paper presents stratigraphic, sedimentological, and provenance data of a continuous Carboniferous–Permian sequence on the southern margin of the Shuangyingshan Block within the southern BOC in NW China. Carboniferous Baishan and Shibanshan formations record a shallowing-upward change from marine tidal flat to continental braided stream environments. Integrated sandstone modes and U-Pb-Hf data indicate that these formations were fed from an orogenic uplift composed of Precambrian and early Paleozoic rocks of the Shuangyingshan and Dunhuang blocks (ca. 2492, 953, and 439–400 Ma). Latest Carboniferous–Early Permian depositional environments shifted from alluvial fans (Ganquan Formation) to delta-front and prodelta environments in an open marine setting (Shuangbutang and Jushitan f
Giovanni Pari; Derek E.G. Briggs; Robert R. Gaines
Abstract:
Soft-bodied fossils of Cambrian age, now known as Burgess Shale-type
biotas, were first described from the Parker Slate of the northwest Vermont
(USA) slate belt in the late 19
th century, 25 years before the
discovery of the Burgess Shale in British Columbia, Canada. Here, we report
the rediscovery of fossiliferous horizons at Parker s Cobble, the site of
the original quarry, which was thought to have been exhausted by
excavation. New discoveries include a radiodont, multiple specimens of a
new bivalved arthropod, a priapulid, and other undescribed forms. Pervasive
soft-sediment deformation suggests accumulation near the toe of a steep
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