| Title | Cambrian wave-dominated tidal-flat deposits, central Wisconsin, USA |
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| Author | MacNaughton, R B ;
Hagadorn, J W; Dott, R H, Jr. |
| Source | Sedimentology 2018 p. 1-30, https://doi.org/10.1111/sed.12546 |
| Year | 2018 |
| Alt Series | Earth Sciences Sector, Contribution Series 20090316 |
| Publisher | Wiley |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf; html; tif |
| Area | Wisconsin; United States of America |
| Lat/Long WENS | -93.0000 -87.0000 47.0000 42.5000 |
| Subjects | regional geology; sedimentology; paleontology; stratigraphy; depositional environment; coastal environment; tidal flats; channels; mud flats; tides; bedrock geology; lithology; sedimentary rocks;
arenites; sandstones; mudstones; siltstones; sedimentary structures; facies; ichnofacies; fossils; ichnofossils; lithofacies; Elk Mound Group; Wonewoc Formation; Eau Claire Formation; Mount Simon Formation; Cruziana; Molluscs; Furongian; Miaolingian;
Trends; Phanerozoic; Paleozoic; Cambrian |
| Illustrations | location maps; cross-sections; lithologic sections; rose diagrams; photographs; sketches; geoscientific sketch maps; tables; plots; block diagrams |
| Program | People Support |
| Released | 2018 10 18 |
| Abstract | In central Wisconsin, Cambrian strata of the Elk Mound Group record deposition on open-coast, wave-dominated tidal flats. Mature, medium-grained quartz arenite is dominated by parallel-bedding with
upper-flow regime parallel-lamination, deposited during high-energy storms that also produced three-dimensional bedforms on the flats. Abundant wave ripples were produced as storms waned or during fair weather, in water depths <=2 m. Indicators of
variably shallow water (washout structures and stranded cnidarian medusae) and subaerial exposure (adhesion marks, rain-drop impressions and desiccation cracks, including cracked medusae) are abundant. Parallel-bedded facies preserve a Cruziana
ichnofacies, similar to other Cambrian tidal-flat deposits. Flats were dissected by small, mainly straight channels, the floors of which were grazed intensely by molluscs. Most channels were ephemeral but some developed low levées, point bars and
cut-banks, probably reflecting stabilization by abundant microbial mats and biofilms. Channels were filled with trough cross-bedding that is interpreted to have been produced mainly during storm runoff. The strata resemble deposits of open-coast,
wave-dominated tidal flats on the east coast of India and west coast of Korea. Ancient wave-dominated and open-coast tidal flats documented to date appear to have been limited to mud-rich strata with 'classic' tidal indicators such as flaser bedding
and tidal bundles. The Cambrian (Miaolingian to early Furongian) Elk Mound Group demonstrates that sandy, wave-dominated tidal flats also can be recognized in the stratigraphic record. |
| GEOSCAN ID | 254289 |
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