Questions tagged [weathering]

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4
votes
1answer
52 views

Why is diabase/dolerite erosion resistant?

Diabase is often considered to be relatively erosion resistant. We can generally find diabase dikes cross-cutting various strata through the geologic landscape, wherein, the diabase dike or sill is ...
6
votes
2answers
77 views

Is there a widely accepted reason for the formation of tafoni?

Expansion of tafoni seems to be based on weathering (seems reasonable enough.) But what creates them in the first place? There are a number of explanations online (Wikipedia lists eight plausible ...
5
votes
1answer
105 views

What caused those colorations in bedrock?

I took those photos in a hurry (sorry, the color is a bit off due to low light, the first picture is the most distorted one). It struck me that the discolorations seem to follow the fissures in the ...
1
vote
2answers
1k views

Erosion without weathering?

In one of my Geography books, the following sentence is written: Though weathering aids erosion, it is not a pre-condition for erosion to take place. How can I justify this? Almost all the forms of ...
7
votes
4answers
618 views

How is this crumbly crystal-rich rock formed?

I found this crumbly rock embedded in the channel walls of a small creek in Everett, WA, USA. (North Creek that flows through McCollum Park.) If possible, I'd like to know how the rock formed... what ...