My nephew found this rock in a stream in Colorado and thinks it may be an egg fossil. It appears to be 2 very different types of rock, with the inner one being very smooth and rounded. Thanks
My nephew found this rock in a stream in Colorado and thinks it may be an egg fossil. It appears to be 2 very different types of rock, with the inner one being very smooth and rounded. Thanks
It looks like a geode to me.
geode - Google Search
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