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#debrite

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Chris White<p>A small <a href="https://sciencemastodon.com/tags/outcrop" class="mention hashtag" rel="tag">#<span>outcrop</span></a> of the <a href="https://sciencemastodon.com/tags/Squantum" class="mention hashtag" rel="tag">#<span>Squantum</span></a> Member of the <a href="https://sciencemastodon.com/tags/Roxbury" class="mention hashtag" rel="tag">#<span>Roxbury</span></a> <a href="https://sciencemastodon.com/tags/Conglomerate" class="mention hashtag" rel="tag">#<span>Conglomerate</span></a></p><p>These <a href="https://sciencemastodon.com/tags/rocks" class="mention hashtag" rel="tag">#<span>rocks</span></a> are in the <a href="https://sciencemastodon.com/tags/BostonBay" class="mention hashtag" rel="tag">#<span>BostonBay</span></a> Group, which is currently dated to <a href="https://sciencemastodon.com/tags/Neoproterozoic" class="mention hashtag" rel="tag">#<span>Neoproterozoic</span></a>. The Squantum Member was interpreted as a <a href="https://sciencemastodon.com/tags/tillite" class="mention hashtag" rel="tag">#<span>tillite</span></a>, possibly associated with the <a href="https://sciencemastodon.com/tags/Gaskiers" class="mention hashtag" rel="tag">#<span>Gaskiers</span></a> <a href="https://sciencemastodon.com/tags/glaciation" class="mention hashtag" rel="tag">#<span>glaciation</span></a>, although there a scant signs like scratched pebbles or faceted cobbles. It is currently commonly interpreted as a <a href="https://sciencemastodon.com/tags/debrite" class="mention hashtag" rel="tag">#<span>debrite</span></a> (debris flow). Details in captions. <br /><a href="https://sciencemastodon.com/tags/geology" class="mention hashtag" rel="tag">#<span>geology</span></a> <a href="https://sciencemastodon.com/tags/glacier" class="mention hashtag" rel="tag">#<span>glacier</span></a> <a href="https://sciencemastodon.com/tags/turbidite" class="mention hashtag" rel="tag">#<span>turbidite</span></a> <a href="https://sciencemastodon.com/tags/Quincy" class="mention hashtag" rel="tag">#<span>Quincy</span></a> <a href="https://sciencemastodon.com/tags/Boston" class="mention hashtag" rel="tag">#<span>Boston</span></a> <a href="https://sciencemastodon.com/tags/Massachusetts" class="mention hashtag" rel="tag">#<span>Massachusetts</span></a> <a href="https://sciencemastodon.com/tags/NewEngland" class="mention hashtag" rel="tag">#<span>NewEngland</span></a></p>
Chris White<p>Anomalous pebble in layered <a href="https://sciencemastodon.com/tags/sedimentary" class="mention hashtag" rel="tag">#<span>sedimentary</span></a> <a href="https://sciencemastodon.com/tags/rock" class="mention hashtag" rel="tag">#<span>rock</span></a></p><p>An angular pebble is conformably surrounded by argillaceous and sandy layers in this <a href="https://sciencemastodon.com/tags/photograph" class="mention hashtag" rel="tag">#<span>photograph</span></a> of the <a href="https://sciencemastodon.com/tags/Neoproterozoic" class="mention hashtag" rel="tag">#<span>Neoproterozoic</span></a> <a href="https://sciencemastodon.com/tags/Squantum" class="mention hashtag" rel="tag">#<span>Squantum</span></a> Member of the <a href="https://sciencemastodon.com/tags/Roxbury" class="mention hashtag" rel="tag">#<span>Roxbury</span></a> Conglomerate. The wide range of clast sizes led to an interpretation as a <a href="https://sciencemastodon.com/tags/glacial" class="mention hashtag" rel="tag">#<span>glacial</span></a> <a href="https://sciencemastodon.com/tags/tillite" class="mention hashtag" rel="tag">#<span>tillite</span></a> thru the 1970s, but the Squantum Member is now mostly interpreted as a <a href="https://sciencemastodon.com/tags/debrisFlow" class="mention hashtag" rel="tag">#<span>debrisFlow</span></a> (<a href="https://sciencemastodon.com/tags/debrite" class="mention hashtag" rel="tag">#<span>debrite</span></a> or <a href="https://sciencemastodon.com/tags/turbidite" class="mention hashtag" rel="tag">#<span>turbidite</span></a>). My <a href="https://sciencemastodon.com/tags/photo" class="mention hashtag" rel="tag">#<span>photo</span></a>.</p><p><a href="https://sciencemastodon.com/tags/Boston" class="mention hashtag" rel="tag">#<span>Boston</span></a> <a href="https://sciencemastodon.com/tags/fieldTrip" class="mention hashtag" rel="tag">#<span>fieldTrip</span></a> <a href="https://sciencemastodon.com/tags/UMassBoston" class="mention hashtag" rel="tag">#<span>UMassBoston</span></a></p>
Chris White<p>Deformed bedding in meta#sedimentary <a href="https://sciencemastodon.com/tags/rocks" class="mention hashtag" rel="tag">#<span>rocks</span></a></p><p>The horizontal bedding of the <a href="https://sciencemastodon.com/tags/Squantum" class="mention hashtag" rel="tag">#<span>Squantum</span></a> Member of the <a href="https://sciencemastodon.com/tags/Roxbury" class="mention hashtag" rel="tag">#<span>Roxbury</span></a> Conglomerate (<a href="https://sciencemastodon.com/tags/Neoproterozoic" class="mention hashtag" rel="tag">#<span>Neoproterozoic</span></a>, <a href="https://sciencemastodon.com/tags/Boston" class="mention hashtag" rel="tag">#<span>Boston</span></a> Bay Group) has been disturbed locally. </p><p>In the <a href="https://sciencemastodon.com/tags/glacial" class="mention hashtag" rel="tag">#<span>glacial</span></a> <a href="https://sciencemastodon.com/tags/tillite" class="mention hashtag" rel="tag">#<span>tillite</span></a> interpretation of the Squantum (favored through at least the 1970s), the distortion might be caused by glaciotectonic drag at the ice base. The current interpretation as a <a href="https://sciencemastodon.com/tags/debrite" class="mention hashtag" rel="tag">#<span>debrite</span></a> or <a href="https://sciencemastodon.com/tags/turbidite" class="mention hashtag" rel="tag">#<span>turbidite</span></a> would probably attribute the deformations to synsedimentary slumping. My <a href="https://sciencemastodon.com/tags/photo" class="mention hashtag" rel="tag">#<span>photo</span></a>. <a href="https://sciencemastodon.com/tags/fieldTrip" class="mention hashtag" rel="tag">#<span>fieldTrip</span></a></p>
Chris White<p>The <a href="https://sciencemastodon.com/tags/glacier" class="mention hashtag" rel="tag">#<span>glacier</span></a> went that-a-way</p><p>The <a href="https://sciencemastodon.com/tags/striations" class="mention hashtag" rel="tag">#<span>striations</span></a> on this face of the <a href="https://sciencemastodon.com/tags/Ediacaran" class="mention hashtag" rel="tag">#<span>Ediacaran</span></a> (ca. 560 Ma) <a href="https://sciencemastodon.com/tags/Squantum" class="mention hashtag" rel="tag">#<span>Squantum</span></a> Member of the <a href="https://sciencemastodon.com/tags/Roxbury" class="mention hashtag" rel="tag">#<span>Roxbury</span></a> <a href="https://sciencemastodon.com/tags/Conglomerate" class="mention hashtag" rel="tag">#<span>Conglomerate</span></a> were probably left by the <a href="https://sciencemastodon.com/tags/Pleistocene" class="mention hashtag" rel="tag">#<span>Pleistocene</span></a> <a href="https://sciencemastodon.com/tags/Laurentide" class="mention hashtag" rel="tag">#<span>Laurentide</span></a> ice sheet, which retreated ca. 12 ka. The striations have the right orientation, from northwest to southeast. </p><p>The Squantum Member was once interpreted as a (<a href="https://sciencemastodon.com/tags/glacial" class="mention hashtag" rel="tag">#<span>glacial</span></a>) <a href="https://sciencemastodon.com/tags/tillite" class="mention hashtag" rel="tag">#<span>tillite</span></a>. The most common contemporary model is a peri-<a href="https://sciencemastodon.com/tags/Gondwana" class="mention hashtag" rel="tag">#<span>Gondwana</span></a> <a href="https://sciencemastodon.com/tags/debrite" class="mention hashtag" rel="tag">#<span>debrite</span></a> (<a href="https://sciencemastodon.com/tags/turbidite" class="mention hashtag" rel="tag">#<span>turbidite</span></a>). </p><p>My <a href="https://sciencemastodon.com/tags/photo" class="mention hashtag" rel="tag">#<span>photo</span></a>. <a href="https://sciencemastodon.com/tags/Boston" class="mention hashtag" rel="tag">#<span>Boston</span></a> <a href="https://sciencemastodon.com/tags/geology" class="mention hashtag" rel="tag">#<span>geology</span></a> <a href="https://sciencemastodon.com/tags/NewEngland" class="mention hashtag" rel="tag">#<span>NewEngland</span></a> <a href="https://sciencemastodon.com/tags/fieldTrip" class="mention hashtag" rel="tag">#<span>fieldTrip</span></a></p>
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