Browsing Department of Geological Sciences (MU) by Thesis Advisor "MacLeod, Kenneth G., 1964-"
Now showing items 1-8 of 8
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Bulk oxygen and carbon isotopic variation in the Late Cretaceous along with morphometric analysis of biserial planktonic foraminifera
(University of Missouri--Columbia, 2012)[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Expected [delta]13C shifts are absent in Tanzanian samples that span the majority of the Turonian Age (93.5 - 89.3 Ma). The [delta]13C values of bulk ... -
Late cretaceous ocean circulation in the south Atlantic and Pacific oceans
(University of Missouri--Columbia, 2019)[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Cooling during the last 15 million years of the Cretaceous is widely believed to have resulted in a reorganization of ocean circulation, with cooler ... -
Midwestern climate records from tree ring [delta]¹³C and [delta]¹⁸O values
(University of Missouri--Columbia, 2009)A 504-year tree ring carbon isotopic time series was generated using samples from living and subfossil white oak trees from northern Missouri. Over the interval from 1931-2002 [delta]¹³C is significantly correlated with ... -
Neodymium and oxygen isotopic constraints on upper Ordovician paleoceanographic evolution across the Dubuque/Maquoketa contact in NE Iowa and SE Minnesota
(University of Missouri--Columbia, 2011)Measurements of conodonts, phosphatic brachiopods, and authigenic phosphate show no consistent trends in [superscript TM]18O[subscript phos] values but do show a gradual 2-3 unit [epsilon][subscript Nd] increase across the ... -
The Ordovician climate : constraints from carbon and oxygen isotopes
(University of Missouri--Columbia, 2016)The Ordovician Period (483 -- 443 Ma) is an attractive interval to study for understanding the earth's climatic system because of the juxtaposition of climatic extremes. The Period is marked by major shifts in climatic ... -
Oxygen isotopes from conodonts of the mid-continent, US : implications for Late Ordovician climate evolution
(University of Missouri--Columbia, 2012)[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] To test competing interpretations of Late Ordovician climate evolution, sea surface temperatures were estimated from oxygen isotope ratios of ... -
Surface and deep water circulation in late Cretaceous North Atlantic greenhouse ocean
(University of Missouri--Columbia, 2009)This research provides the first of its kind empirical data regarding the evolution of Maastrichtian surface to deep ocean circulation in the North Atlantic. Differences in foraminiferal abundances and oxygen and carbon ... -
Temperature trends of the Late Cambrian through the Middle Ordovician : implications for Ordovician climate and biodiversification
(University of Missouri--Columbia, 2019)[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The Ordovician Period includes both the largest and longest period of sustained biodiversification--the Great Ordovician Biodiversification Event ...