Catalog - Siderolina cenomana

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Other pages this level: S. cenomana, S. hamata, S. kochi

Siderolina cenomana

Citation: Siderolina cenomana Schacko 1897

Type age (chronostrat): Cenomanian

I have found so far this extremely small Globigerina-like form only in the Cenomanian of Moltzow and the Cretaceous of the borehole Hirschgarten close to Kopenik-Berlin at a depth of 318 meters. The test is built up of eight chambers in 1½ whorls. Embryonic chamber is spherical, as are the next two following chambers. The fourth chamber is totally different in appearance and forms an elongate, pauch-like, slightly compressed funnel-shaped with a radial, long, outward oriented tubular opening; there must be a second connecting opening with the equally pauch-like fifth and also the round third chamber which, however, cannot be clearly seen because of the strong calcification of the small object. Chambers six and seven are similar in shape, but the eight chamber has spherical to irregular bubble-like shape, without a tubular structure to the outside, and it is distinctly drawn with its other opening towards the lower part of the seventh chamber, which, however, covers it in part. The tupe openings of the chambers have different diameters and length, and are either incompletely developed or broken off in part. The length of the large chambers too cannot be determined, for they seem be unify in a common, hollow space. The pauch-like chambers do also not increase always and proportionally in diameter and length. The specimen figured by Moltzow (Fig. IV) lacks the fourth pauch-like chamber. In Fig. V, the communication-connections of all chambers appear so enlarged, that the slightly compressed, funnel-like chambers form possibly only a coherent hollow space and the eigth chamber is here relatively small developed. The perforation is distinctly minute and somewhat more visible on the last chamber.

References:

Schacko, G. (1897). Beitrag uber Foraminiferen aus der Cenoman-Kreide von Moltzow in Mecklenburg. Archiv des Vereins der Freunde der Naturgeschichte in Mecklenburg. 50: 161-168. gs

CATALOG OF ORIGINAL DESCRIPTIONS: Siderolina cenomana Schacko 1897

Siderolina cenomana

References:

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