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65<br />
The collision of <strong>the</strong> two<br />
“hockey pucks” sets up an<br />
<strong>in</strong>ternal stress field just as<br />
both <strong>the</strong> <strong>Marcellus</strong> black<br />
shale <strong>and</strong> Pottsville coal<br />
enter <strong>the</strong> oil w<strong>in</strong>dow<br />
After Engelder <strong>and</strong> Lash (2008). Tectonic model after Hatcher (2002)