The marker reads (as near as I can make out):
<p><b>MARK TWAIN BRET HARTE TRAIL</b><br>
MARK TWAIN CABIN<br>
Stopping place of packers carrying supplies to miners. Often 200 jackasses on hill over night furnishing concert suggesting name "Jackass Hill".  Very course gold found here, $10,000 taken from 100 square feet of ground. Quartz found contains 3/4 of total weight in gold. Mark Twain, Steve, Jim, and Bill Gillis, and Dick Stoker, the "Dick Baker" in "Roughing It", were cronies. Mark wrote here "Jumping Frog of Calaveras" from notes made at Angels Camp Tavern.<br></p>
— Erected by Tuolumne County Chamber Commerce 1926
<table class="messagebox plainlinks layouttemplate" style="margin:2px 10%;width:auto;border:2px solid #48d;background:#fbfcff;color:#222;border-left-width:8px;border-collapse:collapse;"><tbody><tr><td class="mbox-image" style="padding-left:.9em"><a href="https://meta.wikimedia.org/wiki/commons:User:Willscrlt" title="m:commons:User:Willscrlt"><img alt="Murray Clan Badge.png" src="https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Murray_Clan_Badge.png/48px-Murray_Clan_Badge.png" decoding="async" width="48" height="58" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Murray_Clan_Badge.png/72px-Murray_Clan_Badge.png 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Murray_Clan_Badge.png/96px-Murray_Clan_Badge.png 2x" data-file-width="250" data-file-height="300"></a></td><td class="mbox-text">This photograph is an original work by "<b><a rel="nofollow" class="external text" href="http://willmurray.name/">Will Murray</a> (<a href="//commons.wikimedia.org/wiki/User:Willscrlt" title="User:Willscrlt">Willscrlt</a>)</b>".   Attribution must be given to the author, which includes the author's <b>name</b>, his <b>username in parentheses as shown</b>, and a <b>link</b> to either his Website at <a rel="nofollow" class="external text" href="http://willmurray.name/">http://willmurray.name</a> or his online gallery at <a rel="nofollow" class="external text" href="http://willmurraymedia.com/">http://willmurraymedia.com</a>. The author also appreciates notification if you use his work outside Wikimedia.</td></tr></tbody></table>
CC BY-SA 3.0 us
<p>Flickr: <a rel="nofollow" class="external free" href="https://www.flickr.com/photos/willscrlt/542338083">https://www.flickr.com/photos/willscrlt/542338083</a>
</p>
<table class="messagebox plainlinks layouttemplate" style="margin:2px 10%;width:auto;border:2px solid #48d;background:#fbfcff;color:#222;border-left-width:8px;border-collapse:collapse;"><tbody><tr><td class="mbox-image" style="padding-left:.9em"></td><td class="mbox-text">This photograph was submitted to Wikimedia Commons by "<b><a rel="nofollow" class="external text" href="http://willmurray.name/">Will Murray</a> (<a href="//commons.wikimedia.org/wiki/User:Willscrlt" title="User:Willscrlt">Willscrlt</a>)</b>".</td></tr></tbody></table>