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By C.J. Cleal, B.A. Thomas

This quantity summarizes the result of a survey of British higher Carboniferous websites, undertaken among 1978 and 1990 as a part of the Geological Conservation evaluation (GCR). The GCR used to be the 1st try to investigate the clinical value of all Britain's geological websites and has proved a landmark within the improvement of a coherent geological conservation method during this nation. to make sure that the exams have been in accordance with an organization logical and medical beginning, the variety of medical curiosity was once divided into ninety-seven discrete topic 'blocks', reflecting the common divisions of stratigraphy, palaeogeography and geological approach; Westphalian stratigraphy and Namurian stratigraphy have been of those blocks. the 1st degree within the survey used to be a evaluation of the literature, to set up a compre­ hensive database of web sites. From this, a provisional checklist of probably major websites used to be made and this was once circulated to all appropriate experts during this state and out of the country. while, the websites have been visited to evaluate their actual and no matter if the curiosity was once nonetheless extant. often times, excavation (so-called 'site-cleaning') was once performed to work out if the curiosity of a website will be resurrected or more suitable. The com­ ments made by means of the experts and the sphere observations have been then used to provide a moment website record, which back used to be circulated for comment.

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Magistrorum Marine Band Biostratigraphy " ... , ... Marine bands ~ The lower Homoceras Superzone (Le. HI) is represented by just two marine bands, 35 m apart, containing H. beyrichianum (Haugh) and Isohomoceras subglobosum (Bisat) respectively . These are taken as marking the bases of the zones of these species, although the biostratigraphical control here is not good . 65 m of marine mudstones. Based mainly on palaeontological evidence, Riley, Owens and Swann (in Ramsbottom, 1981) have been able to recognize 19 discrete cycles within this interval, which they term beds A-S.

At Foxhole Point, Verneuilites sigma (Wright) and Bilinguites cf. superbilinguis Bisat have been reported. This suggests the V. sigma Subzone (B. superbilinguis Zone) at the very top of the Marsdenian. Biostratigraphical evidence of the Yeadonian has yet to be found in this section. The Langsettian, in contrast, has been proved at two levels. Near Wanson Mouth, Gastrioceras cf. coronatum Foord and Crick, G. cf. listeri (Sowerby) and Dunbarella sp. have been found at several points and indicate a level equivalent to the Gull Rock Shale near Clovelly, and the listeri Marine Band of coalfields to the north.

The Upper Carboniferous of Devon and Cornwall is not particularly rich in fossils, but intensive work mainly by Arber (1904), Rogers and Arber (1904) and Rogers (1909, 1910) provided enough material to establish the main details of the hipl ad B3)' 20 20 f. -. :: Dartmoor • Town j, . • • ~ . 1 Map of parts of Devon and north Cornwall, showing the distribution of Upper Carboniferous deposits. Based on Thomas (1988, fig. 2). "r,. -=:;__ -- :;:;:#; _------- ----- ",dun Ion ornunon GI Gastrioaras listen horizon Ga Gastrioaras Ql7llJliae horizon Figure 3_2 Relationship between the Crackington, Bideford and Bude fonnations in southwest England.

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