Answers are grounded in this paper and cite their sources.
Discusses the stratigraphic value of some foraminifera from Valanginian-Albian rocks of northwest Germany and the Speeton clay of Yorkshire, England, and correlates the Speeton beds with broad biostratigraphic subdivisions in the lower Cretaceous of northwest Germany. Tabulated data on ranges are included.
No takes yet. Share an insight, caveat, or question.
Mohsin H. Khan (1962) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: