Going through my photos and found this treat from a excursion to Tofino BC. I'm not 100% sure what rock regime dominates on this part of Vancouver island, sure is pretty though. - ThreadSky

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stovetop1321.bsky.social • 4 days ago

Going through my photos and found this treat from a excursion to Tofino BC.

I'm not 100% sure what rock regime dominates on this part of Vancouver island, sure is pretty though.

Comments

sassyzeni.bsky.social•4 days ago

Looks like granite to me, but I’m no geologist!

stovetop1321.bsky.social•4 days ago

I pulled one of the GSC (Geological Survey of Canada) maps for the province. The area is broadly mapped as Triassic Volcanic extrusive rock ie basalt, andesite, rhyolite. For the specific mapping I'd have to do some more focused digging.

stovetop1321.bsky.social•4 days ago

Realized I didn't put my actual conclusion here!

So you're pretty close! From a distance a lot of rock regimes can looks super similar.

I was way off thinking is was zebra dolomite -_- cause I love the stuff.

The BC composition is super cool cause it's partly scraped off the incoming plate.

sassyzeni.bsky.social•4 days ago

What do you think it actually is?

stovetop1321.bsky.social•4 days ago

Given that my gut instinct above (partially dolomotized limestone) was incorrect, further research was needed!

I found a fabulous report from the BCGS on the Kennedy Lake area geology.

This report indicates we are within the Karmutsen formation, a 6km thick volcanic sequence of pillow lavas...

stovetop1321.bsky.social•4 days ago

, pillow breccia and massive basaltic flows.

https://en.m.wikipedia.org/wiki/Karmutsen_Formation

https://cmscontent.nrs.gov.bc.ca/geoscience/PublicationCatalogue/Bulletin/BCGS_B055.pdf

Page 41 of the report has a great figure showing the intersections of the different formations in the area.

Tldr: volcanic rock, mostly fine grained, weathers to a med gray

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