Morphometric Data on Miogypsina (Lepidosemicyclina) bifida, Foraminifera from L-III Reservoir, Mumbai Offshore, India

• Published in: Journal of the Geological Society of India Vol. 91; no. 3; pp. 329 - 333
• Main Authors: Singh, S. D., Raju, D. S. N.
• Format: Journal Article
• Language: English
• Published: New Delhi Geological Society of India 01-03-2018; Springer Nature B.V
• Subjects: Aquatic invertebrates; Bathymetry; Biometrics; Earth and Environmental Science; Earth Sciences; Foraminifera; Geology; Hydrogeology; Limestone; Measuring instruments; Morphometry; Offshore; Reservoirs; Standard deviation; Zonation; Mumbai India; India
• ISSN: 0016-7622; 0974-6889
• DOI: 10.1007/s12594-018-0858-1

A detailed description of the assemblage of
Miogypsina
(
Lepidosemicyclina
)
bifida
Rutten from the sub-surface Mumbai Offshore is presented by carrying out biometric studies on nineteen equatorial sections. The mean V is 47.2 and the mean DI 212μm. The mean DII is 272.35μm and the mean ε 341.76μm. The larger spire has notational value in the range 4.1/2 to 7.1/2 and the smaller spire 1.1/2 to 3.1/2. The species is recorded to be occurring below
M. (L.) excentrica
Tan Sin Hok. In terms of the planktonic zonation, it pertains to the planktonic Zone N6 (Burdigalian). This is the first detailed study of
M.(L.) bifida
Rutten from India. The foraminifer,
M.(L.) bifida
Rutten, recorded from the L-III, a major producing reservoir of Mumbai High field is found in association with
Lepidocyclina
sp.,
Sphaerogypsina
sp.,
Operculina
sp.,
Amphistegina
sp.,
Elphidium
sp. and
Cibicides
sp. along with Bryozoa. The assemblage, recorded from limestone, indicates a shallow inner neritic paleoenvironment (bathymetry 15-20 meters) of deposition.