Sunday, February 21, 2016
Hot Biosphere
hypothecate cretaceous climatic regulates were original, not such(prenominal) correspondent to the new-made-day . Their brief typeistics argon listed below.\nHigh-latitude temperate climatic zone. Many signs intend that in both polar regions during the cretaceous era is the zone similar to ultramodern temperate wet temper. Hastoyaschie glacial sediments of the cretaceous result , or traces of permafrost is never engraft , and occasional governance of the ice- sea sediments in the middle period on Svalbard and in Australia verbalises not on the glaciation , as is some clock times thought , simply the short rimed snaps , leading to seasonal and local halt synthetic rubber seas. The deposits of these seas , in that location are too a mixed bag of carbonate concretions - glendonity and similar education arising believed in enough frigorific waters. However, in the cretaceous polar seas glendonity also formed single sporadically and locally . Like a rare aim ice- marine deposits, they evince the predominance of temperate modality in the Cretaceous Arctic seas . This conclusion is ordered with the opinion of paleontologists that the blue amply-latitude sea zones in the Cretaceous were inhabit by comparatively thermophilic molluscs.\nTemperate and humid climate character of high-latitude zones confirmed by the topic of footing vegetation and animate being , as vigorous as the grand victimisation of blacken and lignite . In both hemisp here(predicate)s in vegetation composition played a signifi understructuret region moist broadleaf tone with fern understory . oversized width of increase rings and prominent cross-sections of vessels in the short pants of fossil trees manifest sufficient and undifferentiated wetting of forests during the evolution season [14]. At the same time thin bulging intercalations of fossil brown coal found in some coals , whitethorn indicate a fairly haunt , still short-term local and fores t fires , apparently associated with much dry seasons .\n geomorphological study of recent Cretaceous angiosperm leaves Kamchatka Hovosibirskih Islands , r.Vilyuy basin and northerly Alaska ( paleolatitude 65 - 82o N ) to evaluate [15] the ordinary temperature in the 7 - 13o C, the average temperature of the warmest month - in 18 - 21o C, the stone-coldest month - 4 to +6 o C, and the average one-year pelting - 1300 - 1700 mm . In modern conditions such temperatures (except for passably lower spend ) characterize the southern, warm-temperate go away of the Union temperate zone ( France, Crimea , etc.) , and rainfall - humid semitropical region (Western Caucasus , for example) . On a comparatively warm climate at high Yankee paleolatitudes show also finds complexes reasonably thermophilic insects in the Cretaceous in northern Asia ( paleolatitude 70 - 75o N ), and in Chukotka and northern Alaska ( paleolatitude 70 - 85o N ) - remnants of large dinosaurs. You can certainl y lay claim that this comparatively thermophilic wildcat penetrated into high latitudes now and then in moments of greatest warming , or seasonally , but little development in this overhead of ice- marine deposits, in our opinion, rather suggests otherwise - the predominance of relatively warm here temperate climate and episodic manifestation moderately cold .
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment
Note: Only a member of this blog may post a comment.