James Craft

James Craft

MS - SUNY - Binghamton
Study of flat-pebble conglomerate beds, esp. temporal and spatial variations in HCS, tidal dunes, and channel deposits.

About

12
Publications
655
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56
Citations
Introduction
Ongoing study of Upper Devonian/Missisippian strata in NY with emphasis on flat-pebble conglomerate beds (e.g. Salamanca Conglomerate and related beds) has correlated the Salamanca (coastal deltaic/tidal deposits) over a wide area. The presence of hummocky cross-strata (HCS) of unusual coarseness (coarse sand to 30 mm pebbles) and scale (~ 1-3 m to > 10 m) suggests strong storms (hurricanes). Variations in these deposits over space and time is of particular interest.
Education
September 1982 - May 1985
Binghamton University
Field of study
  • Geology
September 1973 - May 1977

Publications

Publications (12)
Article
Describes centimetre- to decimetre-thick, sheetlike to lenticular beds of sandstone and siltstone interbedded with mudstone. Unidirectional current-scour marks and tool marks occur on the basal erosion surfaces of the sandstones: their internal structures are hummocky cross strata of various styles, planar laminae, and wave-ripple cross-laminae. Th...
Conference Paper
Full-text available
The orthoquartzitic Salamanca conglomerate evidently records a high-energy Upper Devonian seacoast, with at least meso-tidal range, as indicated by a sand-pebble beach, a flood-dominated delta prograding over marine wave-rippled fine sands, large-scale and coarse-grained HCS, and a sub-aqueous large-scale dune field formed by strong flood tides. Mo...
Conference Paper
Full-text available
Pebbly hummocky cross-stratification is described and interpreted (HCS coarser than fine sand is uncommon in the rock record). Paleohydraulic estimates of large-scale forms (largest hummock wavelengths > 7 meters; largest pebbles > 5 cm) suggest large waves, strong combined flows, and energetic storms/hurricanes, in particular, at the top of the se...
Presentation
Full-text available
The final stages of the Devonian Period is recorded in the hills of Allegany State Park and surrounding area (NY/PA contain the most complete and accessible Upper Devonian stratigraphy on Earth). Extensive outcrops are uncommon on the well forested hillsides with the exception of the escarpment/ block-forming Salamanca Conglomerate: ● House-sized b...
Research
Full-text available
Hourglass Rock City - "Hummocky" Conglomerate As part of a regional study to locate, correlate, and log conglomerate layers with remote sensing and ground truthing, a potential rock city and other "blocky" outcrops were noticed on 1-meter DEM images in the S.W. corner of Allegany State Park near the NY/PA border. Dubbed "Hourglass" based on its D...
Conference Paper
Full-text available
The orthoquartzitic Salamanca conglomerate records a high-energy Upper Devonian seacoast, with at least meso-tidal range, as indicated by a pebbly shoreface and beach, a tide-dominated delta prograding over marine wave-rippled fine sands, and a sub-aqueous large-scale (4m-6m foresets) dune field formed by strong flood tides. Most of the sequence re...
Article
Full-text available
A multi-year study of Odonate occurrences was conducted at a pond in western New York State. Dragonflies and damselflies comprise one of the most distinctive and intriguing groups in the animal kingdom. Classified under the Order Odonata (from Greek, “toothed ones” for serrated jaws), “Odes”, as they’re affectionately known, are carnivorous insects...
Research
Full-text available
Article
Typescript. Thesis (M.A.)--State University of New York at Binghamton, 1985. Includes bibliographical references (leaves 98-121).

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