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Sheets and Incised Channels of the Kilcloher Cliff Section, Ross Formation, Ireland

By
Mark chapin
Mark chapin
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Published:
January 01, 2008

Abstract

The Kilcloher Cliff outcrops of the Carboniferous Ross Formation, western Ireland, provide spectacular, laterally extensive exposures of deep-water sandstones. The geology of these cliffs have been interpreted from photomosaics, with a ground calibration measured section at the west end. Please see the paper on the Kilbaha Bay outcrop for introductory details and details of sedimentary structures, which are much easier to observe and describe in that section (chapin, chapter 51, this volume). The upper part of the west Kilcloher section is dominated by relatively continuous sandstone beds, 0.3-4 m (1-12 ft) thick. Many sandstones are amalgamated, but there are some shales and thinly laminated intervals with enough continuity to break up the section vertically. Although the bed tops and bases appear parallel, the thicknesses of many beds vary across the exposure. A notable feature is the seeming lack of channels in the upper, sandstone-rich section as compared to other sandy exposures of the Ross Formation, where small-scale channels are obvious. The contact between the upper, sandstone-rich cliff section and lower, shalier section is sharp, but not obviously erosional. The lower part of the west Kilcloher cliff section contains an interval of continuous, thin- to thick-bedded sandstones interbedded with approximately equal thicknesses of shales (54% sand overall). These beds display little lenticularity or erosional features, and most sandstone and mudstone beds extend across the entire outcrop section. The lower interval is exposed for more than twice the distance of the upper cliff section, due to weathering over several small folds. The lower interval displays a classic representation layered-sheet architecture.

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Contents

AAPG Studies in Geology

Atlas of Deep-Water Outcrops

Tor H. Nilsen
Tor H. Nilsen
Desceased
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Roger D. Shew
Roger D. Shew
University of North Carolina
Wilmington, North Carolina
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Gary S. Steffens
Gary S. Steffens
Shell International E&P
Houston, Texas
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Joseph R. J. Studlick
Joseph R. J. Studlick
Maersk Oil America Inc.
Houston, Texas
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American Association of Petroleum Geologists
Volume
56
ISBN electronic:
9781629810331
Publication date:
January 01, 2008

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