. Bulletin of the British Museum (Natural History) Geology Supplement. BRITISH AVONIAN CONODONT FAUNAS 23 smaller collections were also made from Gower and Pembrokeshire. Detailed descriptions of the local stratigraphy have been given by George (1927 and 1954), Dixey & Sibly (1918) and Owen & Jones (1955). Pringle & George (1961) have reviewed the regional stratigraphy. Detailed localities and measured sections are given in Figs 59-92 (p. 246), and it is necessary here to give only a brief introduction to the local succession. The youngest strata of the Avonian, the D3 Upper Dibuno
. Bulletin of the British Museum (Natural History) Geology Supplement. BRITISH AVONIAN CONODONT FAUNAS 23 smaller collections were also made from Gower and Pembrokeshire. Detailed descriptions of the local stratigraphy have been given by George (1927 and 1954), Dixey & Sibly (1918) and Owen & Jones (1955). Pringle & George (1961) have reviewed the regional stratigraphy. Detailed localities and measured sections are given in Figs 59-92 (p. 246), and it is necessary here to give only a brief introduction to the local succession. The youngest strata of the Avonian, the D3 Upper Dibunophyllum Zone, or Upper Limestone Shale, are often cut out by Namurian overstep. The succession was collected by us at Mellte Bridge, at the confluence of the Rivers Mellte and Sychryd, near Craig-y-Dinas (SN 911079 : see Owen & Jones 1955) where it consists of 23 ft. of dark shales and interbedded muddy, and rarely crystalline, crinoidal limestones, most of them less than a foot in thickness. The samples yielded over 3,900 identifi- able specimens, whereas beds of similar age from the Black Lias Quarry at The Mumbles, Glamorgan (SS 615883) proved virtually barren in conodonts. The underlying D2 Beds were first collected from exposures in the valley of the River Nedd (SN 912122) but these proved to be unfossiliferous, and further collec- tions were made from Craig-y-Dinas (SN 911099) where some 64 ft. of strata are exposed. These consist of massive crystalline limestones with thin interbedded shales. Near the top of the section a thin irregular band of rolled fish framents and conodonts occurs. The samples yielded over 130 ABERGAVENNY Fig. 6. Map of South Wales to show the main outcrop of the Carboniferous Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural Hist
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