Lower Devonian Bivalves from the Reefton Group, New Zealand |
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Page 49
... anterior adductor scar ( Fig . 30A , B , D , H ) . Anterior margin tightly to broadly rounded ( Fig . 30A , B , D ) ; posterior margin broadly rounded ( Fig . 30F ) ; ventral margin not clearly observed , but likely to be gently arched ...
... anterior adductor scar ( Fig . 30A , B , D , H ) . Anterior margin tightly to broadly rounded ( Fig . 30A , B , D ) ; posterior margin broadly rounded ( Fig . 30F ) ; ventral margin not clearly observed , but likely to be gently arched ...
Page 73
... ventral margin ; umbones orthogyrate ; broad , low anterior internal septum ; chondrophore weak ; ornament of comarginal ridges , about 6 per mm . Description . Shell small , equivalve , ovate , longitudinally elongate and tapering ...
... ventral margin ; umbones orthogyrate ; broad , low anterior internal septum ; chondrophore weak ; ornament of comarginal ridges , about 6 per mm . Description . Shell small , equivalve , ovate , longitudinally elongate and tapering ...
Page 131
... dorsal margin . Anterior margin almost at right angles to dorsal margin ; anteroventral corner rounded ( Fig . 85C ) . Ventral margin strongly sinuate ( Fig . 85C , E ) , with sinus extending obliquely forward towards the umbo ( Fig ...
... dorsal margin . Anterior margin almost at right angles to dorsal margin ; anteroventral corner rounded ( Fig . 85C ) . Ventral margin strongly sinuate ( Fig . 85C , E ) , with sinus extending obliquely forward towards the umbo ( Fig ...
Contents
Stratigraphy of the Reefton Group 24 | 2 |
Age of the Reefton Group | 9 |
Global affinities | 20 |
Copyright | |
1 other sections not shown
Common terms and phrases
accessory scar Adam Mudstone Alexander Mudstone anteriorly ap/ar auricle Baton River bivalves Bolitho Mudstone brachiopod Bradshaw & McCartan Carboniferous chondrophore complete LV Cornellites Ctenodontella dental section dentition Devonian Diagnosis disarticulated dorsal margin dorsomedian scar edentulous elongate Emsian epifaunal escutcheon external faint faunas fossil bands genus Glyptodesma grooves hinge view holotype Inangahua Outlier Inangahua River incomplete inequilateral inflated internal moulds internal plate Johnston lateral length/height ligament Limestone Lower Devonian lunule LV CM mackayi margin Fig Modiomorpha Murray Creek Formation Notonucula Nuculites Nuculoidea ornament Palaeozoic Paleodora pallial line paratype RV Phestia Pojeta posterior adductor scar posterior margin posterior retractor posterior shell posterior teeth posterior umbonal slope posterior wing posteriorly posteroumbonal ridge prosogyrate Prothyris ranfti Reefton Reefton Group reeftonensis retractor rounded sandstone Scale bars scatter diagram sediment shell margin siltstone specimens Taphonomy tooth Type species umbo umbonal cavity umbonal scars valves ventral ventral margin Waitahu Outlier Zealand