Recent and fossil resins from New Zealand and Australia

Autor:	Joseph B. Lambert, Suzanne C. Johnson, James S. Frye, George O. Poinar
Rok vydání:	1993
Předmět:	Archeology Paleontology biology Agathis Earth and Planetary Sciences (miscellaneous) Hymenaea New guinea biology.organism_classification Araucaria Geology Cretaceous
Zdroj:	Geoarchaeology. 8:141-155
ISSN:	1520-6548 0883-6353
DOI:	10.1002/gea.3340080206
Popis:	The carbon-13 nuclear magnetic resonance spectra of fossil resins from New Zealand and Australia have been compared with those of modern and semifossilized materials. The great majority of the fossilized samples have strong spectral similarities to modern Agathis resins and to North American fossil resins, which have been attributed to Agathis. The Agathis-related spectra are different from those of modern Hymenaea and Araucaria. A small subgroup of Late Cretaceous resins from Australia and Papua New Guinea appears to derive from a different botanical source and shows strong resemblances to Claiborne amber from Arkansas. The spectral resonances of the exomethylene carbons degrade over time and on average provide an approximate measure of the geological age of Agathis-related fossil resins. © 1993 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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