- cyclothem
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cyclothem
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cyclothem — ▪ geology complex, repetitive stratigraphic succession of marine and nonmarine strata that are indicative of cyclic depositional regimes. Ideal cyclothem successions are rare, and reconstructions of generalized sequences result from the… … Universalium
cyclothem — A series of beds deposited during a single sedimentary cycle of the type that prevailed during the Pennsylvanian Period. It is an informal, lithostratigraphic unit equivalent to formation . Cyclothems are typically associated with unstable… … Glossary of landform and geologic terms
cyclothem — cy·clo·them … English syllables
cyclothem — ˈ ̷ ̷ ̷ ̷ˌthem noun ( s) Etymology: cycl + Greek thema something laid down more at theme : a stratigraphic unit consisting of a series of beds deposited during a single sedimentary cycle … Useful english dictionary
Carboniferous Period — Interval of geologic time 354–290 million years ago, marked by great changes in world geography. All the landmasses drew closer together as a result of tectonic plate movements. The supercontinent Gondwana occupied much of the Southern Hemisphere … Universalium
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
rhythmite — An individual unit of a succession of beds developed by rhythmic sedimentation; e.g., a cyclothem. The term implies no limit as to bedding thickness or complexity and denotes no time or seasonal connotation. Compare: varve, cyclothem.… … Glossary of landform and geologic terms
Absaroka sequence — The Absaroka sequence was a cratonic sequence that extended from the end of the Mississippian through the Permian periods. It is the unconformity between this sequence and the preceding Kaskaskia that divides the Carboniferous into the… … Wikipedia
climate change — Introduction periodic modification of Earth s climate brought about as a result of changes in the atmosphere as well as interactions between the atmosphere and various other geologic, chemical, biological, and geographic factors within the Earth … Universalium
