A dark-colored igneous rock having a fine-grained, more or less columnar structure.
Traprock
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| Geological Glossary: Traprock |
General term for dark-colored, fine-grained, extrusive igneous rock, especially partially altered, coarse basalt. Often called simply trap.
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 | diabase |
| Diabasic |
| North Branford (city, Connecticut) |
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 | Architecture. McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc. All rights reserved. Read more |
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| Geological Glossary. Peterson Field Guide to Rocks and Minerals, by Frederick H. Pough. Copyright © 1998 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. Read more |
