The middle Devonian marine transgression in north Devon and west Somerset

B. D. Webby*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The lithological and faunal changes through the transition from non-marine Hangman Grits to marine Ilfracombe Beds of North Devon and West Somerset suggest the presence of a major depositional marine transgression. A fauna of thick-shelled lamellibranchs and gastropods occurs in beds lying stratigraphically between the flu-viatile Hangman deposits below, and the shallow-water marine Ilfracombe Beds above, and is considered to indicate an intermediate phase of intertidal depositional conditions. The transgression appears to have advanced across the region in a north-north-easterly direction during Lower-Middle Givetian times following coastal subsidence and possibly an associated rise of sea level.

Original languageEnglish
Pages (from-to)478-488
Number of pages11
JournalGeological Magazine
Issue number6
Publication statusPublished - 1965
Externally publishedYes


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