Abstract
Summary The type succession for the Yoredale Series is slightly amended at the base to include the Hawes Limestone, a name resurrected for the topmost beds (parts of D 1 and D 2 ) of the Great Scar Limestone. The lateral variations of the series, up to the top of the Main Limestone, are described in detail, particularly the “Non-Calcareous Measures” between the major limestones. These may contain minor limestones, capable of limited correlation, as in the Hardrow Scar and Simonstone Cyclothems. The rock types are compared with those of a modern delta and an extensive correlation is found possible, leading to the suggestion that the Yoredale Series results from the intermittent deltaic invasions of a shallow limestone sea. It is deduced that periodic diversions of the delta river produced silting up of the main channel upstream; regional subsidence carried the abandoned delta below sea-level and limestone was deposited. During this time the river was building up a second delta to the east which eventually was similarly abandoned, and the river returned to its old course. Repetition of these events produced the Yoredale Series.
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