Neocomian

[¦nē·ə¦kō·mē·ən]

(geology)

A European stage of Lower Cretaceous geologic time; includes Berriasian, Valanginian, Hauterivian, and Barremian.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Neocomian

(from Neocomium, the Latin name for the canton of Neuchâtel, Switzerland), a division of the Lower Cretaceous. The Neocomian was identified in 1835 by the Swiss geologist J. Thurmann. At first it was considered to be the lowest stage of the Cretaceous system. After the Berriasian, Valanginian, Hauterivian, and Barremian stages were established within the Neocomian in the second half of the 19th century, the Neocomian has usually been understood to mean the superstage comprising these four stages.

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It shows some increasing and decreasing trends mainly observed in Shurijeh (Neocomian, start of Cretaceous), and Aitamir (Cenomanian, start of Upper Cretaceous).

System Stage Formation No Elevation above sea level, m Neogene Pliocene Aghchegil 1 150 Upper Paleocene-Eocene Khangiran 2 1321 Paleogene Paleocene Chelkaman 3 1102 Lower Paleocene Pesteligh 4 1277 Maastrichtian Kalat 5 1249 Maastrichtian Neizar 6 1050 Santonian-Campanian Abtalkh 7 1190 Turonian-Coniacian Abderaz 8 1232 Cretaceous Albian-Cenomanian Aitamir 9 1223 Albian Sanganeh 10 1053 Aptian Sarcheshmeh 11 1019 Neocomian-Aptian Tirgan 12 1149 Neocomian Shurijeh 13 1156 Oxfordian-Kimmeridian Mozduran 14 903 Jurassic Bathonian-Callovian Chamanbid 15 1568 Bajocian Bashkalate 16 1646 Toarcian-Aalenian Kashafrud 17 1402 Table 2 Average contents of clay minerals in the studied formations.

Clay mineralogy of the Jurassic-tertiary sedimentary rocks of the Kopet Dagh basin (Northeastern Iran): implications for paleoclimate

Age of Fahliyan formation in Kuh-e-Surmeh section is Neocomian due to existing fossil association.

According to fossil assemblage above and also based on biozonation of Gollesstaneh [10], "Pseudocyclammina lituus-Dukhania Arabica-Algal zone ll" biozone, was offered for Fahliyan Formation in this section which indicated Neocomian age for this formation's sediments.

Microbiostratigraphy and lithostratigraphy of Fahliyan and Gadvan formations in Kuh-e-Surmeh (Zagros Basin, Southwest Iran)

Nyuni 2 will appraise a location updip from the gas discovered in the Nyuni 1 exploration well in Albian/Aptian (Late Lower Cretaceous age) sands as well as testing the underlying Neocomian (Earliest Lower Cretaceous age) sands.

The Neocomian aged sands expected to be intersected by Nyuni 2 are the main reservoir sands at the Songo Songo Gas Field and at the Kiliwani North Gas Field (Bounty: 5% interest) located on Songo Songo Island 20 km south of Nyuni Island.

Bounty Oil And Gas NL (ASX:BUY) Nyuni 2 Well Spuds

Neocomian to Albian age has been assigned to this formation.

Petrographical study of Ewekoro carbonate rocks, in Ibese, South Western Nigeria

The Tanychorinae Rasnitsyn, 1975 (five genera and 11 species) were dominant during the Neocomian (Townes 1973; Rasnitsyn 1975, 1980; Zhang 1991; Zhang & Rasnitsyn 2003; Kopylov 2010a).

Two new labenopimpline ichneumonids (hymenoptera: Ichneumonidae) from the upper cretaceous of southern Africa

The well log show eight metres of net oil pay in the Neocomian sandstone reservoir at true vertical depths of 660 to 668 metres.

Max Petroleum's ZMA-AN2 development well reaches total depth of 780 metres

With an unconformity in the Berriasian, fluvial siliciclastic sandstones and coarser sediments interfingering with shallow water carbonates and shales characterise the Neocomian (Berriasian to Early Aptian).

La sucesion sedimentaria del ODP Leg 173 y su comparacion con las secuencias tectonosedimentarias de los margenes compresivos de la Placa Iberica: revision general

Other than some Neocomian bivalves from north of the arroyo north of the village of Sierra Mojada, collected by James E.