. Conodonts of the Lower Border group and equivalent strata (lower carboniferous) in Northern Cumbria and the Scottish Borders, Conodonts; Paleontology; Paleontology; Conodonts; Paleontology. REVISED DIAGNOSIS Pa element diagnostic: anterior blade higher than long, fixed for up to approximately half its length, higher than parapets; central trough may be closed by the anterior end of the left parapet; parapets convex upwards; basal cavity bears a medial groove for its entire length. HOLOTYPE British Geological Survey, MPK 1907 (Metcalfe, 1981, pi. l,). TYPE HORIZON AND LOCALITY Haw
. Conodonts of the Lower Border group and equivalent strata (lower carboniferous) in Northern Cumbria and the Scottish Borders, Conodonts; Paleontology; Paleontology; Conodonts; Paleontology. REVISED DIAGNOSIS Pa element diagnostic: anterior blade higher than long, fixed for up to approximately half its length, higher than parapets; central trough may be closed by the anterior end of the left parapet; parapets convex upwards; basal cavity bears a medial groove for its entire length. HOLOTYPE British Geological Survey, MPK 1907 (Metcalfe, 1981, pi. l,). TYPE HORIZON AND LOCALITY Haw Bank Limestone sample 272 of Metcalfe (1981), Haw Bank Quarry, North Yorkshire, ( SE 015532). MATERIAL STUDffiD Pa elements, 259(65) [a blade, 47(1); p blade 65; y blade 12; intermediate blade 107; indeterminable blade mor- phology 28(64). 192 Pa elements complete enough for curvature determination: 104 sinistral, 68 dextral, and 20 straight]. Pb elements, 47(15); M elements, 23(1); Sa ele- ments, 6(2); Sb elements, 3; Sc elements, 5(1). All mate- rial from the Liddel and Lynebank Formations, Lower Border Group. DESCRIPTION Pa elements. The anterior blade is between one-quarter and two-fifths of total element length. It is composed of three to five, rarely six, laterally compressed denticles, fused apart from their tips, and is always developed on the right side of the element. A notch is commonly developed between the blade and the right parapet, occasionally with some medial displacement of the blade. The shape of the blade in lateral view is comparable to that of C. unicornis sensu Rexroad (1981) and may be of a, P , y, or intermedi- ate form (see Text-Fig. 5). a-P intermediate blades are particularly common, denticles increasing in size and height posteriorly, but lacking a conspicuously larger pos- terior denticle. The posteriormost blade denticle is often reclined and is always higher than the anterior end of the right parapet Blade height is greater than or equa
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