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Formation Id help


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I'm having a hard time figuring out the formation of the fossils I found today. The layer is about 4 feet wide. Fresh it appears to be a gray shale. It weathers quickly to a buff very soft siltstone with pale purple swirls. Some fractures show a colorful (red, orange, yellow, black, brown) iron staining. The PA geologic survey map for Altoona marks this as a Brailler formation area but that formation's description doesn't seem to fit what I found. Does this description sound familiar to anyone? If pics would help I can take some tommorow.

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What is the description given for the Brailler Fm? BTW, a shale (clay sized particles) does not weather to a siltstone with greater than clay sized particles.

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