Stromer Spring
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Stromer Spring


Stromer Spring
25 bedrock mortars, cupules, and PCN-style petroglyphs
Elevation 2023 ft.

We used to drink from Stromer Spring in the not-so-distant past. The Park District warns against doing it now.

A nice, single-track trail passes near here. We followed it many times without ever stopping to examine these rocks. If we considered them at all, we dismissed them as being the wrong type of rock in the wrong location for a milling station. So much for our expertise. Thanks to Lou for turning us on to this site.

This is a beautiful protected site.


On our third visit to this site, we took the time to clear dirt and leaf litter off the main rock. Look what we found–PCNs! The distinctive horseshoe-shaped PCNs are known as vulva forms. For an in-depth study of PCNs see Donna Gillette’s 2011 dissertation Cultural Markers on the Landscape: the PCN Pecked Curvilinear Nucleated Tradition in the Northern Coastal Ranges of California.

Photograph by Bill LaCommare.