A reassessment of ‘<i>Globigerina bathoniana</i>’ Pazdrowa, 1969 and the palaeoceanographic significance of Jurassic planktic foraminifera from southern Poland

Abstract

Abstract. ‘Globigerina Ooze’, Foraminiferal Ooze or Carbonate Ooze as it is now known, is a widespread and highly characteristic sediment of the modern ocean system. Comparable sediments are much less common in the geological record although, as we describe here, a number of Middle Jurassic carbonate sediments with distinctive assemblages from Central Europe fulfil many of the criteria. One important component of these assemblages in the Middle Jurassic is ‘Globigerina bathoniana’ Pazdrowa, 1969, first described from the Bathonian sediments near Ogrodzieniec (Poland). The generic assignment of this species and other coeval Jurassic taxa is discussed. This species and many of the other early planktic foraminifera evolved in the Aragonite ll Ocean, together with the other two oceanic carbonate producers: the calcareous nannofossils and the calcareous dinoflagellates. The preservation of carbonate sediments with abundant planktic foraminifera on the sea floor indicates that, by the mid-Jurassic, the carbonate/aragonite compensation depths (and associated lysoclines) must have developed in the water column.

Exceptional Accumulations of Statoliths in Association With the Christian Malford Lagerstätte (Callovian, Jurassic) in Wiltshire, United Kingdom

“…In the Callovian/Oxfordian boundary succession exposed at Redcliff, on the South Dorset coast east of Weymouth, specimens of Conoglobigerina sp., with the same mode of preservation, are known from the uppermost Callovian and lowermost Oxfordian. The presence of near-surface dwelling planktic foraminifera is suggestive of a water depth ~75-100 m as a minimum (Hart et al, 2012). This would support the interpretation of Hesselbo (2008)…”

The long‐term impact of magnesium in seawater on foraminiferal mineralogy: Mechanism and consequences

“…An example of the interplay between the mineralogy of newly originated taxa and selective recovery by subsequent changes in oceanic state can be found in the evolution of planktonic foraminifera. The early planktonic foraminifera, Conoglobigerina , were aragonite producers and evolved from aragonitic benthic ancestors in the high Mg/Ca sw ocean of the Early Jurassic [ Hart et al ., , ; Wernli , , ]. This Conoglobigerina‐Globuligerina‐Favusella lineage appeared to be unsuccessful and did not diversify in the developing calcite II ocean and then became extinct in the mid‐Cretaceous, after which the new calcite‐producing taxa became highly diverse and successful.…”

Global bioevents and the Cretaceous/Paleogene boundary in Texas and Alabama: Stratigraphy, correlation and ocean acidification

“…While the calcareous nannofossils appeared in the Triassic, they did not colonise the open ocean in large numbers until the post-Toarcian (Bown et al, 2004;Bown, 2005). This is almost the same time that the planktic foraminifers appeared in the Tethys Ocean (Wernli, 1995;Wernli and Görög, 1999;Hart et al, 2003Hart et al, , 2012aHudson et al, 2009). The planktic foraminifers did not, however, become diverse and abundant until the Early Cretaceous (Premoli Silva and Sliter, 1999;Hart, 1999;Hart et al, 2002).…”

“…The planktic foraminifers did not, however, become diverse and abundant until the Early Cretaceous (Premoli Silva and Sliter, 1999;Hart, 1999;Hart et al, 2002). All of the Jurassic planktic foraminifers appear to have been relatively simple 'globigerine' forms with aragonitic tests (Hart et al, 2012a). The earliest planktic ooze, with a ~99:1 planktic:benthic ratio has been reported from the mid-Upper Jurassic of Southern Poland (Wierzbowski et al, 1999;Hudson et al, 2005) where these sediments were deposited above the Aragonite Compensation Depth (ACD).…”