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Palynostratigraphy of the Upper Visean deposits from the Mstikhino quarry of the Kaluga region, Russia

Mamontov D. A., Orlova O. A.

Geology, Geophysics and Environment

2012

Vol. 38, no. 4

503--504

The Mstikhino quarry is located 8 km to the north-west of the Kaluga town in the south wing of Moscow syneclise. Twelve palynological samples from the Upper Visean deposits have been collected. Updated technique of the palynological preparation was employed using hydrofluoric and hydrochloric acids to dissolve silicates and carbonates. Then the ultrasonic effect and sifting were applied for the samples. The abundant and well-preserved miospores were obtained from the bluish-grey clays of the lower part of the second quarry bank (layer No. 12). One palynoassemblage MS-6 was established. 61 species were recognized. The palynoassemblage is generally composed of the significant miospore species of the Triquitrites comptus - Cingulizonates bialatus distinctus (CBd) Zone of the Aleksinian regional stage: Lycospora pusilla (Ibrahim) Somers (60%), Schulzospora campyloptera (Waltz) Hoffmeister, Staplin et Malloy (8%), S. conforma (Kedo et Jushko) N. Umnova (4%), Cingulizonates bialatus (Waltz) Smith et Butterworth (5%), Tripartites vetustus Schemel (3%), and Triquitrites comptus Wilson (3%). It is so unusual to find high diversity of the scarce species such as Auroraspora granulata (Kedo) Oshurkova, A. micromanifesta (Hacqubard) Richardson, A. rugosiuscula (Kedo) Byvscheva, A. granulatipunctata (Hoffmeister, Staplin et Malloy) Turnau, Leiotriletes inermis (Waltz) Ischenko, L. suintortus (Waltz) Ischenko, Leiotriletes ornatus Ischenko, L. gulaferus Potonie et Kremp, Trachytriletes commodus Ischenko, T. subintortus Ischenko, Cyclogranisporites punctulatus (Waltz) Luber, C. aureus (Loose) Potonie et Kremp, Granulatisporites granulatus Ibrahim, G. granosus (Ischenko) Oshurkova, G. microgranifer Ibrahim, G. minutus Potonie et Kremp, G. pennatus (Kedo) Mamontov comb, nov, Procoronaspora rara (Palyford) Oshurkova, Iugisporis subintortus (Kedo) Mamontov comb, nov., /. pennatus (Ischenko) Oshurkova, Raistrikia macrura (Luber) Luber, R. clavata Hacquebard, Reticulatisporites cancellatus (Waltz) Playford, Convolutispora jugosa Smith et Butterworth, C. ampla Hoffmeister, Staplin et Malloy, Tripartites incisotrilobus (Naumova) Potonie et Kremp, Triquitrites trivalvis (Waltz) Potonie et Kremp, Diatomozonotriletes trilinearis Playford, Vallatisporites dictyopterus (Waltz) Byvscheva et N. Umnova in the palynoassemblage. An additional point to emphasize is that the association of rare species is not similar to those from the adjacent sections of the Kaluga Region. According to occurrence of the significant species of CBd Zone the age of the studied palynoassemblage is assigned to the Aleksinian age. The results well correspond with the data of previous palynological research. Besides the palynoassemblage MS-6 is compared to the palynoassemblages of Tripartites vetustus - Rotaspora fracta (VF) Zone of Western Europe by the cooccurrence of significant miospores of Tripartites vetustus, Triquitrites marginatus Hoffmeister, Staplin et Malloy, Remysporites magnificus (Horst) Butterworth et Williams and Knoxisporites stephanephorus Love. According to Kmiecik (1986) the presence of Murospora aurita (Waltz) Playford, Calyptosporites arenaceus (Neves et Owens) Oshurkova, Schukospora campyloptera, Tripartites incisotrilobus (Naumova) Potonie et Kremp and Reticulatisporites cancellatus (Waltz) Playford within studied miospore association confirm the correlation of the MS-6 palynoassemblage with the similar ones of the upper part of Diatomozonotriletes saetosus (Ds) Zone of Poland miospore zonation. Most probably that high miospore diversity of the studied palynoassemblage is related to various palaeoecological structures of the terrestrial parent vegetation.