Lower Devonian Period

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• 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

• lower — lower1 [lō′ər] adj. [compar. of LOW1] 1. in a place or on a level below another [lower lip] 2. inferior in rank, authority, or dignity [the lower classes] 3. less in quantity, degree, value, intensity, etc. 4 …   English World dictionary

• Devonian — For the Celtic language, see Southwestern Brythonic language; for the residents of the English county, see Devon. Devonian Period 416–359.2 million years ago …   Wikipedia

• lower — lower1 lowerable, adj. /loh euhr/, v.t. 1. to cause to descend; let or put down: to lower a flag. 2. to make lower in height or level: to lower the water in a canal. 3. to reduce in amount, price, degree, force, etc. 4. to make less loud: Please… …   Universalium

• Devonian — 1. adjective a) of a geologic period within the Paleozoic era; comprises lower, middle and upper epochs from about 415 to 360 million years ago b) Of or pertaining to the English region of Devon. 2. noun …   Wiktionary

• lower — I low•er [[t]ˈloʊ ər[/t]] v. t. 1) to cause to descend; let or put down: to lower a flag[/ex] 2) to make lower in height or level: to lower the water in a canal[/ex] 3) to reduce in amount, price, degree, or force 4) to make less loud or lower in …   From formal English to slang

• lower — I. /ˈloʊə / (say lohuh) adjective 1. comparative of low1. 2. (often upper case) Geology denoting an earlier division of a period, system, or the like: the Lower Devonian. –verb (t) 3. to reduce in amount, price, degree, force, etc. 4. to make… …  

• lower vascular plant — ▪ biology Introduction formerly  pteridophyte,  also called  vascular cryptogam,         any of the spore bearing vascular plants, including the ferns, club mosses, spike mosses, quillworts, horsetails, and whisk ferns. Once considered of the… …   Universalium

• period — Synonyms and related words: Alexandrine, Archean, Archeozoic, Cambrian, Carboniferous, Cenozoic, Comanchean, Cretaceous, Devonian, Eocene, Glacial, Holocene, Lower Cretaceous, Lower Tertiary, Mesozoic, Miocene, Mississippian, Oligocene, Paleocene …   Moby Thesaurus

• Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… …   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