this post was submitted on 08 Apr 2024
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Cool diagram! It's interesting how narrow the band of distinguished composition differences is. Anything above 69% is just felsic, and anything below 45% is ultramafic, and hasn't been created any time recently because the Earth has cooled inside.
Structure-wise, for igneous there's various different kinds of intrusions. For metamorphic and sedimentary there's (of course) layers, as well as faults and folds, and pedosphere formations like drumlins. And then there's other kinds of intrusion (if that's the right term) like salt or various kinds of petroleum.
What I'd really love is geological history laid out on a timeline for some specific area. I'd like to be able to picture it all, instead of just looking at isolated examples of a rock or landform.