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  2. Roxbury Conglomerate - Wikipedia

    en.wikipedia.org/wiki/Roxbury_Conglomerate

    Monument to the 20th Massachusetts Infantry on the Gettysburg Battlefield made of Roxbury Conglomerate. The Roxbury Conglomerate, also informally known as Roxbury puddingstone, is a name for a rock formation that forms the bedrock underlying most of Roxbury, Massachusetts, now part of the city of Boston.

  3. Geology of North America - Wikipedia

    en.wikipedia.org/wiki/Geology_of_North_America

    The geology of North America is a subject of regional geology and covers the North American continent, the third-largest in the world. Geologic units and processes are investigated on a large scale to reach a synthesized picture of the geological development of the continent.

  4. Geology of Massachusetts - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Massachusetts

    The geology of Massachusetts includes numerous units of volcanic, intrusive igneous, metamorphic and sedimentary rocks formed within the last 1.2 billion years. The oldest formations are gneiss rocks in the Berkshires , which were metamorphosed from older rocks during the Proterozoic Grenville orogeny as the proto-North American continent ...

  5. Channel pattern - Wikipedia

    en.wikipedia.org/wiki/Channel_pattern

    There are two main types of channels, bedrock and alluvial, which are present no matter the sub-classification. Bedrock channels are composed entirely of compacted rock, with only patches of alluvium scattered throughout. Because the bedrock is constantly exposed it takes much less stream power to carve the channel.

  6. Geology of New England - Wikipedia

    en.wikipedia.org/wiki/Geology_of_New_England

    New England is a region in the North Eastern United States consisting of the states Rhode Island, Connecticut, Massachusetts, New Hampshire, Vermont, and Maine.Most of New England consists geologically of volcanic island arcs that accreted onto the eastern edge of the Laurentian Craton in prehistoric times.

  7. Glossary of geology - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_geology

    Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...

  8. Geology of Minnesota - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Minnesota

    Map of Minnesota bedrock by age. Shaded relief image: Superior Upland in the northeast, the flat Red River Valley in the northwest, Central Minnesota's irregular landscape, the Coteau des Prairies and Minnesota River in the southwest, and the southeast's dissected Driftless Area along the Mississippi River below its confluences with the Minnesota and St. Croix in East Central Minnesota

  9. Outcrop - Wikipedia

    en.wikipedia.org/wiki/Outcrop

    Some of the types of information that cannot be obtained except from bedrock outcrops or by precise drilling and coring operations, are structural geology features orientations (e.g. bedding planes, fold axes, foliation), depositional features orientations (e.g. paleo-current directions, grading, facies changes), paleomagnetic orientations