What type of clouds are these?

Travelling in a bus through the Rocky Mountains in Colorado I saw these cloud formations. I’ve never seen anything like these before. This was taken around midday on a Summer’s day in the mountains. There was little precipitation or electrical activity, but the shape of the cloud base was very unusual.

Any ideas?

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  1. I saw clouds identical to these while coming into Port Augusta trying to beat a cold front. So, they are certainly pre frontal. Not sure what you would call them. Cumulo something or other!

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