Ficheiro:Graywacke turbidites.jpg

Summary

Bay of Pillars Formation graywacke (Lower to Upper Silurian): Volcaniclastic graywacke and argillite turbidites in massive and amalgamated beds, with graded beds and rhythmic turbidites. High sand/shale ratios. Locally calcareous sandstone, with limestone lenses. Proximal inner to mid-fan facies turbidites. Graptolites identified on argillaceous bed surfaces. Unit also contains corals and brachiopods (map numbers 49 and 52, Table 1). Unit thickness thickness uncertain, probably several thousand meters. Prince of Wales Island.

Copyright status:

This image is public domain because it was first published by the U.S. Geological Survey

Source:

http://pubs.usgs.gov/of/1999/of99-168/of99-168-pamphlet.html