The photo shows a fossil of <i>Didymograptus murchisoni</i>, a graptolite from the Ordovician period.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/86624586@N00/">kevinzim / Kevin Walsh</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/86624586@N00/27094091/">Didymograptus murchisoni</a>