Paleofertility estimates are derived from organic-carbon accumulation rates determined in nonbioturbated mid-Cretaceous deep-sea deposits using organic-carbon preservation factors observed in laminated sediments from anoxic Holocene environments. The estimated mid-Cretaceous primary production rates are as much as an order of magnitude lower than those measured in today's oceans. An evaluation of dissolved oxygen budgets using a simple oceanic circulation model indicates very low deep-water renewal rates in mid-Cretaceous oceans.

First Page Preview

First page PDF preview
You do not currently have access to this article.