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20 Cards in this Set
- Front
- Back
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bryophyte
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member of the plant order Bryophyta, including the mosses, liverworts, and hornworts.
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caddisflie
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aquatic insect of the order Trichoptera.
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Cambrian
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earliest period of the Paleozoic, thought to have covered the span of time between 543 and 490 million years ago.
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Devonian
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The fourth period of the Paleozoic Era. The Devonian Period includes the time from 417 to 354 million years ago.
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dolomite
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sedimentary rock composed largely of calcium magnesium carbonate.
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estuarine
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area where a river empties into an ocean; influenced by the ocean tides, which results in a mixture of salt water and fresh water.
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fluvial
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produced by the action of a stream or river.
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gastropod
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one of class of mollusks that includes snails.
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isostatic
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theoretical equilibrium that tends to exist in the Earth's crust, in which any disturbance, such as erosion, sedimentation, change in size of ice sheets, is compensated for by an opposite movement in the Earth's crust
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morainal ridge
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mound or ridge of till deposited directly by glacial ice.
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Ordovician
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second earliest period of the Paleozoic era (after the Cambrian and before the Silurian), thought to have covered the span of time between 490 and 443 million years ago
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ostracod
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small mobile marine with right and left valves for shells and an indistinctly segmented body.
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paleosol
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buried soil.
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Paleozoic
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era of geologic time from 570 to 225 million years ago, from the end of the Precambrian to the beginning of the Mesozoic.
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pelecypod
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bivalve: marine or freshwater mollusks having a soft body with platelike gills enclosed within two shells hinged together.
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pollen
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fine, dustlike powder discharged from the male part of a flower
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subareal
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in air and above water.
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Precambrian
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The period in Earth's history from its formation to 670 million years ago.
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sinkhole
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crater formed when the roof of a cavern collapses; usually found in areas of limestone rock.
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till sheet
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layer of unsorted unstratified sediment deposited directly from ice.
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