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Benthonic foraminifera from 18 samples selected from Site 261 (Figure 1) were studied in order to determine their age and stratigraphic range. The samples, which were selected by V. A. Krasheninnikov, were washed and treated during the leg; the microfauna was selected at the Geological Institute of the Academy of Sciences of the USSR in Moscow. The following samples have been studied at Site 261: 29, CC; 30-2, 7-9 cm; 30-4,44-46 cm;30-3, 63-64 cm; 30, CC; 31-3, 10-12 cm; 31-2, 22-23 cm;31-4,32-34 cm; 31-5, 60-62 cm; 31, CC; 32-4, 40-42 cm; 32-2, 59-60 cm; 32-3, 83-85 cm; 32, CC; 33, CC; 35-5, 120-122 cm; 35-5, 128130 cm; and 35, CC. All of the samples studied contain foraminifera, together with radiolarians, ostracods, sponge spicules, and, in one sample (Sample 30, CC), fish scales. The foraminiferal assemblages are characterized by the following features: 1) All the foraminifera are benthonic. Agglutinated forms are predominant and some assemblages consist entirely of these forms (Samples 31-2, 22-23 cm; 30-2, 79 cm). 2) Some assemblages contain many species and numerous specimens (Samples 32, CC; 32-3, 83-85 cm; 32-4, 40-42 cm; etc.). Others contain few species represented by only sporadic specimens (Samples 35-5, 120122 cm; 32-2,59-60 cm; 31-4, 32-34 cm; 29, CC). 3) Most of the benthonic foraminifera are well preserved. Agglutinated foraminifera as a rule are better preserved than calcareous ones. 4) The foraminifera from Site 261 exhibit considerable diversity with over 90 species present. These have been attributed to 44 genera from 12 families. The systematic composition of the foraminiferal fauna is as follows: Family Astrorhizidae (Rhizammina, Hyperammina, Hippocrepina, Saccorhiza) Family Saccamminidae (Pelosina, Sorosphaerà) Family Ammodiscidae {Ammovertella, Ammolagena, Lituotuba, Glomospira, Glomospirella) Family Hormosinidae (Reophax) Family Lituolidae {Haplophragmoides, Ammobaculites, Haplophragmium, Placopsiliná) Family Textulariidae {Textularia, Bigenerinà) Family Trochamminidae (Trochammina) Family Ataxophragmiidae {Verneuilinoides, Dorothia) Family Nodosariidae {Lenticulina, Planularia, Marginulina, Vaginulina, Frondicularia, Falsopalmula, Dentalina, Nodosaria, Bojarkaella, Lingulina, Lagena, Pseudonodosaria) Family Polymorphinidae (Pyrulina, Ramulina) Family Ceratobuliminidae (Epistomina?) Family Spirillinidae {Spirilliná) Figure 1. Location of Leg 27, Site 261.

Distribution of Benthonic Foraminifera in Upper Jurassic and Lower Cretaceous Deposits at Site 261, DSDP Leg 27, in the Eastern Indian Ocean