Newbie
December 2015 - Feb 7, 2017 7:30:12 GMT
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Post by thesaurusrex on Dec 2, 2015 6:19:54 GMT
In Baja California. Semi-circular in shape, flatter than the surroundings, and is noticeably a different color as well. Is it something similar to Alberta's Caribou mountains? Or an ancient volcanic caldera? There are slightly similar circular features nearby, but not as evident. |
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Master Guide
March 2015 - Jan 20, 2022 4:27:51 GMT
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Post by Hill on Dec 7, 2015 16:28:50 GMT
The Baja peninsula has many granitic intrusions. Geologically these features would be defined as stocks. |
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Newbie
December 2015 - Feb 7, 2017 7:30:12 GMT
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Post by thesaurusrex on Dec 8, 2015 8:15:46 GMT
Interesting! Thanks  |
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Master Cartographer
April 2015 - Sept 29, 2023 6:00:50 GMT
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Post by syzygy on Feb 7, 2017 9:01:56 GMT
The Baja peninsula has many granitic intrusions. Geologically these features would be defined as stocks. i think thesaurusrex is talking about that 3 mile radius depression with lighter colour:   |
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Full Member
January 2020 - Apr 9, 2023 12:23:53 GMT
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Post by leong on Feb 1, 2020 13:12:51 GMT
The round feature looks like a laccolith , with a variety of exposed rocks eroding away inside the uplifted area. The uplift explains why the erosion above the laccolith is faster, as it cracked the existing rock and sped up erosion of it. Thus this particular laccolith is a depression rather than a lump. Multiple rings around the laccolith showing the uplift of the rock strata is a strong indicator too.
stocks should be lumps, or circles , of a homegenous igneous rock .. With no sign in the previously existing rock of the stock specifically.
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