Topic
Graphoceras
About: Graphoceras is a research topic. Over the lifetime, 3 publications have been published within this topic receiving 27 citations.
Papers
1 Jan 1976
TL;DR: In this paper, two sections in the Inferior Oolite (Bajocian Stage, Middle Jurassic) of the north Cotswolds (Harford Cutting and Jackdaw Quarry) are described, the age and significance of their ammonite faunas are discussed and the more important of these ammonites are figured.
Abstract: Two sections in the Inferior Oolite (Bajocian Stage, Middle Jurassic) of the north Cotswolds (Harford Cutting and Jackdaw Quarry) are described, the age and significance of their ammonite faunas are discussed and the more important of these ammonites are figured. The specimen of Graphoceras recorded by Buckman from the Snowshill Clay is shown to have originated from the Lower- Trigonia -Grit, whilst a new specimen of G. cf. apertum (S. Buckman) is recorded from the Tilestone. It is shown that the base of the Gryphite/ Lobothyris buckmani -Grit is Hyperlioceras discites Zone in age, as is the Lower- Trigonia -Grit. The bulk of the Gryphite/ L. buckmani -Grit is Sonninia ovalis Subzone, Witchellia laeviuscula Zone in age, whilst the Upper- Trigonia -Grit is to be correlated with the upper, Parkinsonia acris Subzone of the Strenoceras (Garantiana) garantiana Zone and the Clypeus -Grit with the Parkinsonia bomfordi Subzone of the Parkinsonia parkinsoni Zone.
14 citations
Journal Article•
9 citations
1 Jan 2015
TL;DR: New collecting from the Middle Jurassic beds of the classic Bakonycsernye locality yielded very rich ammonite assemblages from the topmost Aalenian and the Lower Bajocian, with several stratigraphically diagnostic species and rich representation of early otoitids and stephanoceratids.
Abstract: New collecting from the Middle Jurassic beds of the classic Bakonycsernye locality yielded very rich ammonite assemblages from the topmost Aalenian and the Lower Bajocian. A single bed, called here the Ovale Bed gave a high diversity Fissilobiceras ovale Zone fauna, with several stratigraphically diagnostic species and rich representation of early otoitids and stephanoceratids. These latters include topotypes of species described in classic monographs from this place. Here the earliest otoitids and stephanoceratids, Docidoceras wysogorskii and Westermannites chocsinskyi, respectively, appear first in beds belonging into the Graphoceras concavum Zone. The type horizon of W. telegdirothi, the best-known stephanoceratid from Csernye, most probably is within the Hyperlioceras discites Zone. Two new species are described, the otoitid Trilobiticeras (Emileites) kecskemetii n.sp. and the stephanoceratid Mollistephanus ottiliae n.sp., both form the Ovale Bed. Faunal affinities and the early development of the Otoitidae and Stephanoceratidae are discussed.
6 citations
Performance Metrics
| Year | Papers |
|---|---|
| 2015 | 1 |
| 1983 | 1 |
| 1976 | 1 |