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
New Geology articles published online ahead of print in February
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Current issue articles for
Geological Society of America
Geosphere, posts articles online regularly. Topics for articles posted for
Geosphere this month include feldspar recycling in Yosemite National Park; the Ragged Mountain Fault, Alaska; the Khao Khwang Fold and Thrust Belt, Thailand; the northern Sierra Nevada; and the Queen Charlotte Fault.
Feldspar recycling across magma mush bodies during the voluminous Half Dome and Cathedral Peak stages of the Tuolumne intrusive complex, Yosemite National Park, California, USA
Louis F. Oppenheim; Valbone Memeti; Calvin G. Barnes; Melissa Chambers; Joachim Krause .
Abstract: Incremental pluton growth can produce sheeted complexes with no magma-magma interaction or large, dynamic magma bodies communicating via crystal and melt exchanges, depending on pulse size and frequency of intrusions. Determining the degree and spatial extent of crystal-melt exchange along and away from plutonic contacts at or near the empla
Emilia A. Caylor; Barbara Carrapa; Kurt Sundell; Peter G. DeCelles; Joshua M. Smith
Abstract: The Upper Cretaceous Fort Crittenden Formation exposed in the Santa Rita and Huachuca Mountains of southeastern Arizona is a syntectonic deposit that has been associated with Laramide tectonic activity. However, the spatio-temporal relationships among Cretaceous sedimentation, magmatism, basement exhumation, and possible flat slab-related processes in the southern Laramide region remain poorly understood. Age controls for uplift and erosion of local topography and syntectonic deposition in response to deformation remain particularly poor. The Fort Crittenden Formation comprises 800?2500 m of locally derived fluvial to alluvial fan sedimentary rocks and records paleodrainage reorganization in response to active tectonics. Changes in sedimentary facies, provenance, and paleoflow suggest deposition in a tectonically partitioned intraforeland basin. New detrital zircon data constrain the timin
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IMAGE: Figure 2: Mosaic showing the middle segment of the largest litter pile. Upstream is in the lower right corner. A higher-resolution photo is available. view more
Credit: Guangfa Zhong and Xiaotong Peng
Boulder, Colo., USA: Benthic plastic litter is a main source of pollutants in oceans, but how it disperses is largely unknown. This study by Guangfa Zhong and Xiaotong Peng, published today in
Geology, presents novel findings on the distribution patterns and dispersion mechanisms of deep-sea plastic waste in a submarined canyon located in the northwestern South China Sea.
Evidence collected from a series of manned submersible dives indicate that the plastic litter items transported and deposited in the canyon are most likely controlled by turbidity currents. Here the plastic litter items are highly heterogeneously distributed: Up to 89% of them occur in a few scours of the canyon.
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