کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4466743 1622219 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-density bioturbated sandstones in the Mississippian Mauch Chunk Formation, eastern Pennsylvania, USA: Implications for continental ecospace exploitation
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
High-density bioturbated sandstones in the Mississippian Mauch Chunk Formation, eastern Pennsylvania, USA: Implications for continental ecospace exploitation
چکیده انگلیسی

Continental communities represented by complex, rapidly evolving invertebrate ecosystems first appeared during the Early Palaeozoic Era and are recorded in surface and subsurface bioturbation. The Mississippian-age Mauch Chunk Formation contains several high-density bioturbated, fine-grained sandstones that are preserved as erosively based fluvial channel fills. Several of these channel sandstone bodies are almost completely homogenized by subsequent bioturbation throughout their entire thickness, up to a maximum depth of 1.6 m.The Mauch Chunk ichnofossil record demonstrates that high-density bioturbation occurred at least 30 my prior to the Permian and well before its widespread distribution in the Triassic. Hence, the Late Mississippian high-density bioturbated sandstones demonstrate a much earlier high-density exploitation of the continental subsurface ecospace than previously known.


► We have discovered intensely bioturbated channel deposits in Mississippian deposits.
► Intense bioturbation has homogenized these channel deposits.
► These deposits push back the onset of intense ecospace utilization by 30 myr.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Palaeogeography, Palaeoclimatology, Palaeoecology - Volumes 365–366, 1 December 2012, Pages 294–301
نویسندگان
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