Abstract

The shore zone of the Middle Devonian Catskill clastic wedge in New York State consists of (1) a storm-wave-dominated muddy marine shelf with sandy shoals; (2) sandy, tide-influenced channels with wave-and tide-influenced mouth bars; (3) sandy and muddy tidal flats, including channels, mouth bars, and washovers; and (4) muddy brackish bays, lakes, and flood plains. The spatial organization of these subenvironments suggests a wave- and tide-influenced deltaic shoreline. Meter-scale sequences can be related to processes such as lateral migration and filling of tidal channels, progradation of channel-mouth bars and tidal flats, and filling of coastal bays; these may be related to channel switching. Asymmetrical regressive-transgressive sequences that range from tens of meters to >100 m thick can be correlated over many kilometers with fully marine and fluvial deposits. Such sequences record a combination of eustatic sea-level changes and tectonically induced changes in sediment supply and subsidence rate. However, at present it is very difficult to determine the relative importance of these controls.

First Page Preview

First page PDF preview
You do not currently have access to this article.