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| age |
a distinctive period of cultural or geologic time. [1/11 definitions] |
| B horizon |
the subsoil in a geologic soil profile, bearing a concentration of material leached from the topsoil. |
| earthquake |
a shaking or other movement of part of the earth's surface, resulting from volcanic activity or the sudden release of tension along geologic fault lines. |
| epoch |
(cap.) a subdivision of a geologic period. [1/3 definitions] |
| era |
(caps.) any of the five largest divisions of geologic time, often subdivided into periods. [1/3 definitions] |
| fossil |
the remains or trace of a living organism from an earlier geologic age, embedded in earth or rock. [2/3 definitions] |
| metamorphic |
exhibiting, characterized by, or pertaining to geologic changes in the structure or constitution of rock. [1/2 definitions] |
| paleoclimate |
the earth's climate in a former geologic time period. |
| paleodataset |
an organized collection of data about former geologic time periods. |
| paleontology |
the scientific study of life in past geologic periods through examination of animal and plant fossils. |
| plate tectonics |
(used with a sing. verb) the geologic theory that the earth's crust consists of several independent plates floating on semiliquid magma, whose constant motion is the cause of continental drift, volcanic eruption, and the like. |
| salt dome |
a domelike structure produced in geologic strata by the intrusion of salt, often indicative of oil or gas deposits. |
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