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Tuatara: Volume 16, Issue 1, April 1968

FIG. 1: Values for Jurassic and Cretaceous temperatures based on oxygen isotope analyses of belemnites. Analyses of Australian Dimitobelindae, published by Dorman and Gill (1959, p. 91); Lowenstam and Epstein (1954, p. 222), and Bowen (1961 a), have been included to help fill a gap in the New Zealand belemnite sequence in the Lower Cretaceous. — The minimum values, representing the least exchanged carbonates, are shown by the shaded curve. The continuous curve shows the minimum values of West E…

FIG. 1: Values for Jurassic and Cretaceous temperatures based on oxygen isotope analyses of belemnites. Analyses of Australian Dimitobelindae, published by Dorman and Gill (1959, p. 91); Lowenstam and Epstein (1954, p. 222), and Bowen (1961 a), have been included to help fill a gap in the New Zealand belemnite sequence in the Lower Cretaceous.The minimum values, representing the least exchanged carbonates, are shown by the shaded curve. The continuous curve shows the minimum values of West European belemnite palaeotemperatures determined by Lowenstam and Epstein (1954, fig. 10, p. 226). The broken curve is from Bowen (1961b, fig. 2, p. 82) and is the result of an averaging of the results then available.

FIG. 1: Values for Jurassic and Cretaceous temperatures based on oxygen isotope analyses of belemnites. Analyses of Australian Dimitobelindae, published by Dorman and Gill (1959, p. 91); Lowenstam and Epstein (1954, p. 222), and Bowen (1961 a), have been included to help fill a gap in the New Zealand belemnite sequence in the Lower Cretaceous.
The minimum values, representing the least exchanged carbonates, are shown by the shaded curve. The continuous curve shows the minimum values of West European belemnite palaeotemperatures determined by Lowenstam and Epstein (1954, fig. 10, p. 226). The broken curve is from Bowen (1961b, fig. 2, p. 82) and is the result of an averaging of the results then available.