Precambrian non-marine stromatolites in alluvial fan deposits, the Copper Harbor Conglomerate, upper Michigan
نویسندگان
چکیده
منابع مشابه
Putative domal microbial structures in fluvial siliciclastic facies of the Mesoproterozoic (1.09 Ga) Copper Harbor Conglomerate, Upper Peninsula of Michigan, USA.
The Copper Harbor Conglomerate is a Mesoproterozoic (1.09 Ga) freshwater sedimentary sequence that outcrops in the Upper Peninsula of Michigan. The formation was deposited during infilling of the failed Midcontinent Rift and contains fluvial, lacustrine, and alluvial fan facies. This study describes and analyzes the formation of small domal structures preserved in fluvial sandstone facies withi...
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Laura K. Baumgartner,1† John R. Spear,2 Daniel H. Buckley,3 Norman R. Pace,4 R. Pamela Reid,5 Christophe Dupraz1 and Pieter T. Visscher1* 1Department of Marine Sciences, University of Connecticut, Groton, CT 06340, USA. 2Division of Environmental Science and Engineering, Colorado School of Mines, Golden, CO 80401, USA. 3Department of Crop and Soil Sciences, Cornell University, Ithaca, NY 14853,...
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Water and debris fl ows exiting confi ned valleys have a tendency to deposit sediment on steep fans. On alluvial fans where water transport of gravel predominates, channel slopes tend to decrease downfan from ~0.10–0.04 to ~0.01 across wide ranges of climate and tectonism. Some have argued that this pattern refl ects grain-size fi ning downfan such that higher threshold slopes are required just...
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In the present study, we test the relevance of a number of environmental factors on alpha and beta ostracod diversities, at species and family level. Ostracods were sampled from several substrates, including sediment and root systems of various floating aquatic macrophytes, from 48 environments (both lentic and lotic habitats, ranging from the river itself, over connecting channels linking with...
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Alluvial fans develop at the base of drainages where feeder channels release their solid load (Blair and McPherson, 2009; Leeder et al., 1998; Harvey et al., 2005). A classic fan-shape forms where there is a well-defined topographic apex. Multiple feeder channels, however, often blur the fan-shape resulting in a merged bajada. Alluvial fans can be found in almost all terrestrial settings. These...
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ژورنال
عنوان ژورنال: Sedimentology
سال: 1983
ISSN: 0037-0746,1365-3091
DOI: 10.1111/j.1365-3091.1983.tb00713.x