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While finding contact between rocks can be easy for an area with lots of exposure and distinct rock type, it can be rather uncommon. In reality, most rocks are covered by drift or weathered heavily that it can be really confusing to look at. There are even cases where the whole succession are basically the same looks and colour from afar (which what happened to me in Wales... grey rock as far as the eye can see...). But fear not, we will cover things that we can do to distinguish them.
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