Talk:Franciscan Assemblage

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Prehistoric tools section removed[edit]

I removed this section:

Archaeological recovery of Franciscan chert prehistoric tools from Native American sites in the western USA acknowledges the use of Franciscan material as a diagnostic indicator of rock source and thus the presumption of ancient trading patterns among tribes. For example finds of Franciscan chert in Central California suggest extensive trade between tribes of the San Francisco Bay Area with Chumash peoples.[1]

While it is certainly possible that there was "extensive trade between tribes of the San Francisco Bay Area with Chumash peoples", this is not supported by the reference -- [1] -- which says nothing of trade. San Luis Obispo County has abundant outcrops of Franciscan rocks, including the Morro Bay area, the subject of the reference. Anyone feel free to put this paragraph back if there is a better reference, i.e. one that specifically traces that particular chert to the San Francisco Bay Area. (The first sentence of the paragraph may indeed be true; we just need a different example.) Cheers, Antandrus (talk) 04:40, 6 October 2010 (UTC)

Oldest ages in JKf are circa 170 Ma (certain high grade metamorphic blocks). Most is Cretaceous (145-65 Ma) but the King Range terrane on Mendecino coast is as young as Miocene. However, the Marin Headlands terrane contains oceanic cherts as old as about 200 Ma. Don't have time edit now, maybe over Xmas. Geodoc (talk) 03:24, 6 November 2011 (UTC)
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