scholarly journals <i>Nematosphaeropsis downii</i> sp. nov.: a new dinoflagellate cyst from Miocene sediments in the Bay of Biscay

1986 ◽  
Vol 5 (1) ◽  
pp. 7-10 ◽  
Author(s):  
S. Brown
Keyword(s):  
Deep Sea ◽  
Early Miocene ◽  
Bay Of Biscay ◽  
Dinoflagellate Cyst ◽  
Age Range ◽  
Drilling Project

Abstract. A new fossil dinoflagellate cyst Nematosphaeropsis downii sp. nov. is described from Miocene sediments encountered in Leg 80 of the Deep Sea Drilling Project. The age range of this species is restricted to the Early Miocene on available evidence.

New species of dinoflagellate cysts and other palynomorphs from the latest Miocene and Pliocene of DSDP Hole 603C, western north Atlantic

2003 ◽  
Vol 77 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Martin J. Head ◽  
Geoffrey Norris
Keyword(s):  
New Species ◽  
North Atlantic ◽  
Deep Sea ◽  
New Genus ◽  
Dinoflagellate Cysts ◽  
New Genus And Species ◽  
Early Pliocene ◽  
Dinoflagellate Cyst ◽  
Lower Pleistocene ◽  
Drilling Project

Detailed investigation of the essentially complete uppermost Miocene through Lower Pleistocene sequence in Deep Sea Drilling Project (DSDP) Hole 603C, western North Atlantic, has revealed the presence of the new dinoflagellate cyst speciesLejeunecysta hatterasensis, Lejeunecysta interrupta, Corrudinium devernaliae, andPyxidinopsis vesiculata, as well as the acritarchsLeiosphaeridia rockhallensisHead new species andLeffingwellia costatanew genus and species. Independent magnetobiostratigraphic control of DSDP Hole 603C constrains the ranges of these new species.Lejeunecysta interruptan. sp. appears to range no higher than lowermost Pliocene at 5.2 Ma,Pyxidinopsis vesiculatan. sp. has a range top at about 4.5 Ma in the Lower Pliocene,Corrudinium devernaliaen. sp. has a well-defined range of 4.7–4.1 Ma within the Lower Pliocene, andLeiosphaeridia rockhallensisn. sp. has a similarly well-defined range of 4.4–3.9 Ma within the Lower Pliocene. The presence ofLeiosphaeridia rockhallensisn. sp. in the Ramsholt Member of the Coralline Crag Formation, eastern England, supports an Early Pliocene age for this member.

Geological setting and principal results of drilling on the margins of the Bay of Biscay and Rockall Plateau during Leg 48

1980 ◽  
Vol 294 (1409) ◽  
pp. 65-75 ◽  
Keyword(s):  
Deep Sea ◽  
Lower Cretaceous ◽  
Structural Development ◽  
Bay Of Biscay ◽  
Sea Floor ◽  
Passive Margins ◽  
Geological Setting ◽  
History Of ◽  
Sea Floor Spreading ◽  
Drilling Project

During Leg 48 of the IPOD phase of the Deep Sea Drilling Project, seven holes were drilled on the margins of the Bay of Biscay and Rockall Plateau to compare the evolution of passive margins of contrasting age and structural development. The geological setting and principal results of the drilling are outlined for each margin. We discuss the history of rifting and subsidence on these margins in relation to the sea floor spreading history of the adjacent ocean basins. Implications of the results for the nature of unconformities at passive margins and anoxic episodes during the Lower Cretaceous are discussed briefly.

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