9 research outputs found
The Homerian carbon isotope excursion (Silurian) within graptolitic successions on the Midland Platform (Avalonia), UK:implications for regional and global comparisons and correlations
Get PDFProvenance of microcrystalline carbonate cement in limestone–marl alternations (LMA): aragonite mud or molluscs?
No full textThe English Episcopate in The Reign of Henry Vii
No full text184 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1965.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Depositional model for peat swamp coal facies evolution using sedimentology, coal macerals, geochemistry and sequence stratigraphy
No full textLong-period orbital climate forcing in the early Palaeozoic?
No full textFacies indicators and geochemical proxies of early Palaeozoic global climate cooling suggest episodes of fluctuating glacio-eustasy and severe cold or glaciation from the Mid–Late Cambrian to Silurian (c. 85 myr), with a mean frequency of 2.6 myr. Long-period orbital time series predicted through the Phanerozoic are used to generate sine waves to test against these data; the null hypothesis of no orbital influence is rejected with a high confidence level. Cooling episodes appear most frequent through the Late Ordovician leading up to the Hirnantian glacial maximum, but even ‘greenhouse’ intervals of the Early–Mid-Ordovician and early Silurian provide evidence for periodic cooling episodes
Oxygen isotope variability in conodonts: implications for reconstructing Palaeozoic palaeoclimates and palaeoceanography
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