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Thanks to EVERYBODY for obliging me with such rapid responses! The points obviously go to the first answer, but all comments were useful (when will we be able to share out points?!) 4 KudoZ points were awarded for this answer
Explanation: As a native American English speaker, "bed of granite" sounds much better to me than "bank of granite" but since I am not an expert in geology, keep in mind that I may not be aware of the technical distinctions. My dictionary lists "bed" or "deposit".
Collins Spanish English Dictionary 1993 by HarperCollins Publisher
mollyk France Local time: 10:05 Native speaker of: English
Explanation: Instead of bank or bed how about a quarry.