Serpentine Maps

I have put a lot of work into improving maps of exposed ultramafic (serpentine) rocks in California, Oregon, and Washington. Anyone who knows a local area is invited to help (you can just advise me - I will handle all the map generation).

One example is shown at

Publicado el 15 de febrero de 2023 18:42 por jhorthos jhorthos


@jhorthos, it is my understanding that there are areas within Sierra Azul Open Space Preserve (near Los Gatos, CA) that are serpentine.
Thanks for all the work you're doing on this project!

Publicado por truthseqr hace 10 meses

@truthseqr I will take a look to see if I can figure it out. Thanks!

Publicado por jhorthos hace 10 meses

Yeah I have made some additions in that area and two regions are on the USGS maps. If you want me to send specifics let me know.

Publicado por jhorthos hace 10 meses

I'd be happy to help out with SLO county.

Publicado por paulexcoff hace 10 meses

Hi Paul - that would be great! If you send me your regular email I can send images (or better yet KML files which are easy to load into Google Earth). - James

Publicado por jhorthos hace 10 meses

This open area is a tiny serpentine outcrop:

Publicado por jenniferlchandler hace 10 meses

Cool - that spot lies just outside a USGS boundary so I just added a little bulge to cover it. That is exactly the kind of outcrop I can't do from sat maps. - James

Publicado por jhorthos hace 10 meses

This might be useful for Serpentine leads if you haven't already incorporated it:

Also this site (map at bottom):

Publicado por yerbasanta hace 7 meses

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