Yes. South central PA. 6-8 feet of red clay then down to at least 800 feet solid limestone. This was true of my main well and has held true on the first 3 geothermal bore holes. See my posts in the last few pages of "DIY well drilling / trench digging for GSHP"
Likely different where you are as only 12 miles away a buddy of mine just had his well drilled and hit no limestone at all and no red clay.
Regards
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