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R. B. Rickards 1967. The Wenlock and Ludlow succession in the Howgill Fells (north-west Yorkshire and Westmoreland). Q J GEOL SOC LONDON 123, 215–49.
R. B. Rickards 1976. The sequence of Silurian graptolite zones in the British Isles. GEOL J 11, 153–88.
B. R. Rust 1965. The stratigraphy and structure of the Whithornarea of Wigtownshire, Scotland. SCOTT J GEOL 1, 101–33.
C. T. Scrutton & J. A. McCurry 1987. The derivation, biostratigraphy and palaeogeographic significance of corals from Silurian deep-sea turbidite facies in the south-west Southern Uplands. SCOTT J GEOL 23, 49–64.
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P. T. Warren 1964. The stratigraphy and structure of the Silurian (Wenlock) rocks south-east of Hawick, Roxburghshire, Scotland. Q J GEOL SOC LONDON 120, 193–222.
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