ammonoid limestones

См. также в других словарях:

• Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …   Universalium

• 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

• Triassic Period — Interval of geologic time, с 248–206 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms… …   Universalium

• geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …   Universalium

• Cretaceous Period — Interval of geologic time from с 144 to 65 million years ago. During the Cretaceous the climate was warmer than today. In the seas, marine invertebrates flourished, and bony fishes evolved. On land, flowering plants arose, and insects, bees in… …   Universalium

• Marcellus Formation — Stratigraphic range: Middle Devonian …   Wikipedia

• Givetian Stage — ▪ geochronology       uppermost of the two standard worldwide divisions of Middle Devonian (Devonian Period) rocks and time. Givetian time spans the interval between 391.8 million and 385.3 million years ago. It was named for exposures studied… …   Universalium

• Nautiloid — Nautiloids Temporal range: 495–0 Ma …   Wikipedia

• Tertiary Period — Interval of geologic time, 65–1. 8 million years ago. It constitutes the first of the two periods of the Cenozoic Era, the second being the Quaternary. The Tertiary has five subdivisions: (from oldest to youngest) the Paleocene, Eocene, Oligocene …   Universalium

• Bajocian Stage — ▪ geology       second of the four divisions of the Middle Jurassic Series, representing all rocks formed worldwide during the Bajocian Age, which occurred between 171.6 million and 167.7 million years ago during the Jurassic Period. (Some… …   Universalium

• Hettangian Stage — ▪ geology       lowest of the four divisions of the Lower Jurassic Series, representing all rocks formed worldwide during the Hettangian Age, which occurred between 199.6 million and 196.5 million years ago during the Early Jurassic Period. The… …   Universalium