Gravel Run
... that a borehole dug at the mouth of Gravel Run in the late 1800s revealed 38 different strata?
... that a borehole dug at the mouth of <b id="mwAqM"><a class="mw-redirect" href="./Gravel_Run_(Black_Creek)" id="mwAqQ" rel="mw:WikiLink" title="Gravel Run (Black Creek)">Gravel Run</a></b> in the late 1800s revealed 38 different <a href="./Stratum" id="mwAqU" rel="mw:WikiLink" title="Stratum">strata</a>?