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Conusphaera mexicana

Edited by Paul Bown on Sun, 13/05/2012 - 00:12
Citation: 

Conusphaera mexicana Trejo, 1969

Diagnosis: 

Tapering nannoliths with steeply sloping rim and central area filled with a core of radially arranged elements, which in LM shows relatively uniform birefringence with an axial extinction line. Most commonly seen in side view. 

Remarks: 

Short (Conusphaera mexicana minor) and tall (Conusphaera mexicana mexicana) subspecies are distinguished. Tethyan distribution.

Similar species: 

Conusphaera rothii (Thierstein, 1971) Jakubowski, 1986

Geological Time Data
Geological Range (top to base): 
NJ18
NJ17a
Stratigraphic notes: 

Most commonly recorded in the Tithonian. Some authors suggest it ranges into the Aptian.

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