The upper Bartonian–Priabonian shallow-marine deposits in the Biga Peninsula (NW Turkey) contain ... more The upper Bartonian–Priabonian shallow-marine deposits in the Biga Peninsula (NW Turkey) contain some hyaline larger benthic foraminifers (LBF) with a test architecture similar to ‘orbitoidiform’ foraminifers, but displaying some distinctive and complex morphological features that are recorded here for the first time. These coarsely porous specimens are characterized by a flat, disc-shaped, fragile, and smooth test with a layer of equatorial chambers/chamberlets, surrounded by poorly developed lateral chamberlets, never forming a discrete layer on either side of the equatorial layer. The nepionic stage is very distinctive because the bilocular embryonic apparatus is followed by a semi-rounded, notably large auxiliary chamber with a characteristic wavy outline, and consecutive cyclical chambers. The cyclical chamber arrangement is later transformed into annular cycles with numerous, complex arcuate- to cup-shaped chamberlets, as observed in equatorial sections. Bigaella orbitoidiform...
Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas, 2019
The background to the preparation of the rudist sections for the ongoing complete revision of the... more The background to the preparation of the rudist sections for the ongoing complete revision of the Bivalvia volumes of the ‘Treatise on Invertebrate Palaeontology’ is described. The progress on publication is reported. The plans for further work are outlined. Three introductory chapters on rudists have already been published in ‘Treatise Online’ (University of Kansas, Paleontological Institute). Future work will be devoted to the preparation of the taxonomic descriptions of genera and a synoptic example of which is provided for the genus Pachytraga.
Proceedings of the Yorkshire Geological Society, 2018
A review of the Chalk of the Northern Province recognizes six formations, five of which (Hunstant... more A review of the Chalk of the Northern Province recognizes six formations, five of which (Hunstanton, Ferriby, Welton, Burnham and Flamborough formations) crop out in northern Norfolk, Lincolnshire and Yorkshire, and a sixth (Rowe Formation) is buried beneath the drift of Holderness. The Hunstanton, Ferriby and Flamborough formations are largely devoid of flints, whereas the Welton (other than its two basal members) and Burnham formations have nodular and tabular flints, respectively. Previous work on the lithostratigraphy and marker beds is presented, and an overview of the distribution of the more important macrofossils is provided. Especial attention is given to the succession at Speeton through the Hunstanton, Ferriby and lower Welton formations with details of the oxygen and carbon isotope signatures. The Speeton section is internationally important because of its expanded Albian-Mid Cenomanian succession. Small sections of the Burnham Formation in Speeton–Buckton cliffs are also presented for the first time. The appendix reviews the relevant Cretaceous stage boundaries with reference to the Chalk of the Northern Province together with details of the fossil zones that are used in this paper.
The Yellow Limestone Group (Eocene) in the Central Inlier of central Jamaica consists of two sedi... more The Yellow Limestone Group (Eocene) in the Central Inlier of central Jamaica consists of two sedimentary cycles, each represented by a lower clastic division and an upper carbonate division. The lower cycle has a more restricted distribution than the upper cycle, erosion having locally removed it particularly in the south. Only the upper cycle is considered in detail here. The upper cycle can be divided into a lower clastic division (Guys Hill Formation) characterised by fluvial conglomerates and sandstones and restricted marine sandstones, heterolithics and mudrocks, and an upper carbonate division (Chapelton Formation) characterised by more open marine foraminiferal and molluscan wackestones, packstones and grainstones. Detailed mapping and logging have constrained the basin architecture, and four parasequences have been recognized within the Guys Hill Formation. Parasequences show a transition from fluvial dominated facies in the east to more open marine dominated facies in the w...
Exceptionally well-preserved (silicified) hippuritid rudists occur in the El Rayo Formation (lowe... more Exceptionally well-preserved (silicified) hippuritid rudists occur in the El Rayo Formation (lower Maastrichtian) of south-western Puerto Rico. Three species belonging to three different genera are present: Caribbea muellerreidi (VERMUNT), Laluzia peruviana (GERTH) and Parastroma guitarti (PALMER). Acid digestion of the limestones has resulted in a collection with numerous three-dimensional left and right valves many with the preservation of the minute details of the pore system. The morphological features of each species are described, and many features are illustrated for the first time. The new material, coupled with descriptions from other studies, demonstrates that six genera of endemic hippuritids evolved in two separate radiations in the New World: an older radiation of forms that had pallial canals in their left valves (Barrettia, Whitfieldiella and Parastroma) and a younger radiation of forms lacking pallial canals in their left valves (Laluzia, Caribbea and Praebarrettia)....
The upper Bartonian–Priabonian shallow-marine deposits in the Biga Peninsula (NW Turkey) contain ... more The upper Bartonian–Priabonian shallow-marine deposits in the Biga Peninsula (NW Turkey) contain some hyaline larger benthic foraminifers (LBF) with a test architecture similar to ‘orbitoidiform’ foraminifers, but displaying some distinctive and complex morphological features that are recorded here for the first time. These coarsely porous specimens are characterized by a flat, disc-shaped, fragile, and smooth test with a layer of equatorial chambers/chamberlets, surrounded by poorly developed lateral chamberlets, never forming a discrete layer on either side of the equatorial layer. The nepionic stage is very distinctive because the bilocular embryonic apparatus is followed by a semi-rounded, notably large auxiliary chamber with a characteristic wavy outline, and consecutive cyclical chambers. The cyclical chamber arrangement is later transformed into annular cycles with numerous, complex arcuate- to cup-shaped chamberlets, as observed in equatorial sections. Bigaella orbitoidiform...
Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas, 2019
The background to the preparation of the rudist sections for the ongoing complete revision of the... more The background to the preparation of the rudist sections for the ongoing complete revision of the Bivalvia volumes of the ‘Treatise on Invertebrate Palaeontology’ is described. The progress on publication is reported. The plans for further work are outlined. Three introductory chapters on rudists have already been published in ‘Treatise Online’ (University of Kansas, Paleontological Institute). Future work will be devoted to the preparation of the taxonomic descriptions of genera and a synoptic example of which is provided for the genus Pachytraga.
Proceedings of the Yorkshire Geological Society, 2018
A review of the Chalk of the Northern Province recognizes six formations, five of which (Hunstant... more A review of the Chalk of the Northern Province recognizes six formations, five of which (Hunstanton, Ferriby, Welton, Burnham and Flamborough formations) crop out in northern Norfolk, Lincolnshire and Yorkshire, and a sixth (Rowe Formation) is buried beneath the drift of Holderness. The Hunstanton, Ferriby and Flamborough formations are largely devoid of flints, whereas the Welton (other than its two basal members) and Burnham formations have nodular and tabular flints, respectively. Previous work on the lithostratigraphy and marker beds is presented, and an overview of the distribution of the more important macrofossils is provided. Especial attention is given to the succession at Speeton through the Hunstanton, Ferriby and lower Welton formations with details of the oxygen and carbon isotope signatures. The Speeton section is internationally important because of its expanded Albian-Mid Cenomanian succession. Small sections of the Burnham Formation in Speeton–Buckton cliffs are also presented for the first time. The appendix reviews the relevant Cretaceous stage boundaries with reference to the Chalk of the Northern Province together with details of the fossil zones that are used in this paper.
The Yellow Limestone Group (Eocene) in the Central Inlier of central Jamaica consists of two sedi... more The Yellow Limestone Group (Eocene) in the Central Inlier of central Jamaica consists of two sedimentary cycles, each represented by a lower clastic division and an upper carbonate division. The lower cycle has a more restricted distribution than the upper cycle, erosion having locally removed it particularly in the south. Only the upper cycle is considered in detail here. The upper cycle can be divided into a lower clastic division (Guys Hill Formation) characterised by fluvial conglomerates and sandstones and restricted marine sandstones, heterolithics and mudrocks, and an upper carbonate division (Chapelton Formation) characterised by more open marine foraminiferal and molluscan wackestones, packstones and grainstones. Detailed mapping and logging have constrained the basin architecture, and four parasequences have been recognized within the Guys Hill Formation. Parasequences show a transition from fluvial dominated facies in the east to more open marine dominated facies in the w...
Exceptionally well-preserved (silicified) hippuritid rudists occur in the El Rayo Formation (lowe... more Exceptionally well-preserved (silicified) hippuritid rudists occur in the El Rayo Formation (lower Maastrichtian) of south-western Puerto Rico. Three species belonging to three different genera are present: Caribbea muellerreidi (VERMUNT), Laluzia peruviana (GERTH) and Parastroma guitarti (PALMER). Acid digestion of the limestones has resulted in a collection with numerous three-dimensional left and right valves many with the preservation of the minute details of the pore system. The morphological features of each species are described, and many features are illustrated for the first time. The new material, coupled with descriptions from other studies, demonstrates that six genera of endemic hippuritids evolved in two separate radiations in the New World: an older radiation of forms that had pallial canals in their left valves (Barrettia, Whitfieldiella and Parastroma) and a younger radiation of forms lacking pallial canals in their left valves (Laluzia, Caribbea and Praebarrettia)....
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