Palaeontological dating

Posted by / 28-Jul-2020 05:08

Palaeontological dating

The structure and composition of environmentally equilibriated vegetation is controlled by, and therefore reflects, climate.Vegetation types can be recognised in modern vegetation and correlated with temperature regimes.This suggests that the ocean was warmer at the beginning of the Late Cretaceous and there was not such a variety in temperature from the equator to the poles as there is today. The tiny calcareous foram fossil, Nephrolithus frequens, which shifted towards the equator in the Maastrichtian , suggests global cooling occurred.This is supported by North Atlantic planktonic foram distributions which also trended away from the poles with time.At mid latitudes, open canopy woodlands and forests were dominated by a mixture of conifers and ferns. Low latitude (near the equator) vegetation tended to be xeromorphic and only patchily forested suggesting a hot arid environment.It has been well established that the terrestrial plant record indicates an appreciably more equable world than today, with temperate forests extending to the polar regions. Leaf size: This is related strongly to temperature, humidity/water availability, and light levels.The idea that dinosaurs coped with high latitudes (i.e.near the poles) for at least 65 million years through the Cretaceous suggests that cold and darkness may not have been the prime factors causing their extinction, as has sometimes been maintained.

The traditional approach has been confined to material visible to the naked eye, but increasing attention is paid in modern studies to spores and pollen.

It is known that the sea level at this time was substantially higher than it is today.

This allowed many marine biota to spread, such as the ammonites and belemnites into north-western Europe.

the climate at the poles was not drastically different from that at the equator.

The distribution of fossils of organisms that lived in the sea provide valuable information about the oceans and climate at the time the organisms were alive.

palaeontological dating-66palaeontological dating-27palaeontological dating-76

One thought on “palaeontological dating”

  1. “We’re aware of this customer’s plan and excited about the unique qualifications of our telecom marketing platform for their projects,” commented CEO Scott Kettle.

  2. YOZ -----Youth Only Zone YPA -----Young Politicians of America YPB -----Yardcraft, Personnel, Barracks YPC -----Young People's Chorus of New York City YPD -----Yellow Page Directory YPE -----Your Planet Earth YPF -----Yellowstone Park Foundation YPG -----Young Pharmacists' Group YPH -----Young Professionals of Houston YPI -----Young People's Institute YPJ -----Yayasan Pendidikan Jayawijaya YPK -----Yayasan Panca Karsa YPL -----You're Probably Lost YPM -----Yellow Pages Media YPN -----You're Probably Nuts YPO -----Young President's Organization YPP -----Young Professionals Program YPQ -----Yale Political Quarterly YPR -----Young Person's Railcard YPS -----Yellow Pages Superhighway YPT -----Youth Protection Training YPU -----Yale Political Union YPV -----Youth Pride Village YPW -----Young Performers Workshop YPX -----Yeast-extract Peptone Xylose YPY -----Your Precious You YPZ -----Young People Zone YQA -----Yorkshire Quality Alliance YQB -----Quebec, Quebec YQC -----Yield Quality Control YQD -----Yi Quan Dao YQE -----Yquem YQF -----Prototype Drone Fighter YQG -----Windsor, Ontario YQH -----Young, Queer, and Homeless YQI -----Your Quest Internet YQJ -----North Africa YQK -----Youthquakers YQL -----Youth Quake Live YQM -----Yield Quality Management YQN -----Yorkshire Quality Network YQO -----Aylmer, Ontario YQP -----Quartz-Plagioclase Gneiss YQQ -----Comox, British Columbia YQR -----Year-Quarter YQS -----Young Quiet and Single YQT -----Thunder Bay, Ontario YQU -----University of Queensland Library YQV -----Yorkton, Saskatchewan YQW -----Yantai-Qing-dao-Wulian YQX -----Gander, Newfoundland YQY -----Sydney, Nova Scotia YQZ -----Quartz Mountain Resources YRA -----Yacht Racing Association YRB -----Youth Risk Behavior YRC -----Yorkshire Riding Centre YRD -----Youth Resources Division YRE -----You'RE YRF -----Y Re Ference (axis reference point) YRG -----Your Rocket Gallery YRH -----Yves R. YRI -----York-rite Research Institute YRJ -----Youth Riders Journal YRK -----York International Journal YRL -----Yellowhead Regional Library YRM -----Yahweh's Restoration Ministry YRN -----Yacht Racing Newsletter YRO -----Year-Round Operations YRP -----Youth Restoration Program YRQ -----Trois Rivieres, Quebec YRR -----Youth Retreat Resources YRS -----Years YRT -----York Region Transit YRU -----Why Are You ....