caa a22 4500 38638472X CHVBK 20180307112055.0 cr unu---uuuuu 161130s1989 xx s 000 0 eng 10.1017/S0263593300028625 doi S0263593300028625 pii (NATIONALLICENCE)cambridge-10.1017/S0263593300028625 Ocean temperatures and isotopic compositions through time [Elektronische Daten] Fossil assemblages can give quantitative estimates of palaeotemperatures, by comparison with modern biota, only in the recent geological past. Oxygen isotopic palaeotemperatures on calcareous or phosphatic fossils are potentially available for the whole Phanerozoic. Their reliability is limited by physiological effects (generally believed minor), preservation (for which criteria are available), and by uncertainty in the isotopic composition of ancient seawater. The latter is greatly affected by glaciation. In the Cenozoic, the relative contribution of ice-volume change and temperature change in producing isotopic variations can largely be resolved by analysing planktonic and benthic foraminifera in deep-sea cores. For earlier times only continental shelf deposits are available. In the Mesozoic, reasonable assumptions about ocean isotopic composition lead to palaeotemperature estimates that suggest generally higher temperatures than at present, particularly for mid- to high latitudes. This agrees with estimates based on biotic distributions. Late Palaeozoic glaciation is reflected in variable isotopic compositions in high palaeolatitude areas. In the earlier Palaeozoic, well-preserved fossils indicate either oceans enriched in 16O compared to today's or generally higher temperatures; controversy continues about the relative importance of the two effects. Copyright © Royal Society of Edinburgh 1989 oxygen isotopes nationallicence palaeoceanography nationallicence palaeoclimates nationallicence Hudson J. D. Department of Geology, University of Leicester, LEI 7RH, U.K. Anderson T. F. Department of Geology, University of Illinois at Urbana-Champaign, 245 Natural History Building, 1301 West Green Street, Urbana, IL 61801, U.S.A. Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/3-4(1989), 183-192 0263-5933 80:3-4<183 1989 80 TRE https://doi.org/10.1017/S0263593300028625 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0263593300028625 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hudson J. D. Department of Geology, University of Leicester, LEI 7RH, U.K NATIONALLICENCE 700 1- Anderson T. F. Department of Geology, University of Illinois at Urbana-Champaign, 245 Natural History Building, 1301 West Green Street, Urbana, IL 61801, U.S.A NATIONALLICENCE 773 0- Transactions of the Royal Society of Edinburgh: Earth Sciences Royal Society of Edinburgh Scotland Foundation 80/3-4(1989), 183-192 0263-5933 80:3-4<183 1989 80 TRE CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge