Paleontology and stratigraphy

Biodiversity of the upper Famennian conodonts from Kuznetsk basin

Andreeva E.S.

A.A. Trofimuk Institute of Petroleum Geology and Geophysics SB RAS; Novosibirsk State University, Novosibirsk, Russia

Andreeva_Katya_91@mail.ru

Upper Famennian sequences are cropped out in the western part of the Altai-Sayan Folded Area (ASFA) within marginal structures of the Kuznetsk Basin.

Section “Nevsky” is situated in 50 km on the north-west of Kemerovo town, on the left side of Yaya River, downstream from confluence of its tributary Barzass River. It is exposed near Nevsky village by the Anzhero-Sudzhensk-Kemerovo railway excavations. For the first time this section was described by A.V. Tyzhnov in 1938, who indicated presence of brachiopods in the upper Famennian [Tyzhnov, 1938]. More detailed description of this section was published by Ya.M. Gutak [Gutak, 2006] noted presence of brachiopods, bryozoans, conodonts and fish remains. Recently this section was re-investigated by collaborators from IPGG SB RAS to clarify biostratigraphic characteristics of ASFA late Famennian strata.

Section “Nevsky” is represented by terrigenous rocks with rare carbonate intercalates, often composed of brachiopod shell-rock. Twelve samples were dissolved for microfossils. They revealed presence of conodonts, gastropods, ostracods, bivalves and fish remains. Most diverse fauna was obtained from the lower part of the section. Conodonts occur through all the section, among them: Icriodus, Pelekysgnathus, Polygnathus and Siphonodella. Revealed conodonts are grey-brown, semitransparent, shiny, well preserved and have sharp-angled shape of their elements. Conodonts are distributed irregularly along the section. Most abundant assemblages were collected from the base of the section including Icriodus, Polygnathus and Siphonodella. Number of conodonts reduce towards the upper part of the section, where mainly Pelekysgnathus were collected.

Distribution of conodonts in the section “Nevsky” allowed to align it with conodont praesulcata Zone defining the uppermost part of Famennian.

New method of investigation of bentic Foraminifera assembly across Paleocene - Eocene in north Schousf (Nehbandan), east of Iran

Bahramali A.

Geological Survey of Eastern Iran, Payamenoor University, Tehran, Iran

alibahramali@Gmail.com

In this Research I study the section that is exist in north of Schousf at southern Khorasn province. I collected totally 78 thin section at profile.

The longitude of my section is 60 18´-60 13´ Eastern and its latitude is 31 47´52˝-31 52´44˝. northern based on these analyses, from the bottom to up I have three Sequences in this section.

The layers from the 1-35^th belong to CHAH CHO CHO formation and 36^th-41^th layers belong to the formation that called ZIBRO and the formation that pertain to 42^th-48^th layer is DEBIL. we can equivalent the ZIBRO formation with DEBIL formation.

Base on its Microfacies (Foraminifera) at end 34 Genus and 24 Species and also identity 4 assemblage of foraminifera with Deltoid diagram:

1. First assembly have 20% Hyaline, 40% Porcellaneous & 40% Agglutinated. Include Fallotella alavensis, Haymanella paleocenica, Idalina sinjarica, Glomalveolina primaeva, Pseudolacazina donatae, Laffitteina bibensis, Periloculina sp., Cuvillierina sp., Miscellanea miscella, Broeckinella sp. , miliolids (Quinqueloculina sp., Triloculina sp. etc.), green algae,

Upper Paleocene

2. Second assembly have 80% Hyaline, 15% Porcellaneous & 5% Agglutinated. Include

Nummulites with small groups containing N. frassi, N. partchi and N. deserti, Assilina yvettae, Rotalia sp., Nummulites globulus, Nummulites convexa, Ranikothalia sindensis, Operculina exiliformis, Operculina patalensis, Miscellanea miscella, Miscellanea sp. , Ranikothalia sp. (n. s), Smoutina sp.

Upper Paleocene

3. Third assembly have 10% Hyaline, 60% Porcellaneous & 30% Agglutinated. Include

Sistanites iranica, Idalina sinjarica, Quinquloculina sp. , Globotextularia sp.,Valvulina sp. Pseudolacazina donatae. Upper Paleocene

4. Forth assembly have 20% Hyaline, 50% Porcellaneous & 30% Agglutinated. Include

Alveolina aff. decipiens, Alveolina aff leupoldi, Glomalveolina cf. primaeva Triloculina sp. , Quinquloculina sp. , Textularia sp. pseudolacazina sp. Lower Eocene

First Assemblage Second Assemblage

Third Assemblage Forth Assemblage

Fig. Paleoenvironment and locality of Foraminifera assemblage

References:

1. Akhtar M.&A.A.Butt.1999,Microfacies and foraminiferal assemblages from the Early Tertiary rocks of the cala Chita Range (Northern Pakistan). Geologie Mediterranneene,26(3-4):185-201.

2. Alavi,M,1991:Sedimentary and structural characteristics of the paleo-Tethys remnants in northeastern Iran.Geol.Soc.Of Amer.Bull.V.103,pp.983-992.

3. Babazadeh,S.A.2003,Biostratigraphyie et controles paleogeographiques de la zone de suture de IIran oriental. Implications sur la fermeture Tethysienne.These de doctorat,Universite d’Orleans,France,384p.

4. Babazadeh,S.A.2004 ,Litho – biostratigraphy of Paleogene sedimentary succesion in Sahlabad province (South Birjand) and evolution on Neo – Tethyan basin closure. Scientific project,No.08/1896,1-45.

5. Babazadeh,S.A.2008,Lower Eocene transgressive successions of Sahlabad province, eastern Iran, implication of biostratigraphy and microfacies analysis, Revue de Paleobiologie, Geneve,27(2):1-11

6. Beavington-Penney,S.J.and A.Racey,2004,Ecology of extant Nummulitids and other larger benthic foraminifera application in Palaeonvironmental analysis:earth science,v.67,p.219-265.

7. Berberian,M,et al,1983:The southern Caspian,a compressional depresson floored by a trapped,modifisd volcanologique,40(2),pp.121-123.

8. Brasier,M.D.,1975d,an outline history of seagrass comunities.paleontology 18,681-702.

9. Cosovic,v.k.Drobne,and A.Moro,2004,Palaeoenvironmental model for Eocene foraminiferal limestone of the Adriatic carbonate platform(Island peninsula):facies,no.50,p.61-75.

10. Flugel,E.,2004,Microfacies of carbonate

11. Loeblich,A.R.and H. Tappan,1998,Foraminiferal genera and their classification:van Nostrand Reinhold Company,New York,970p.

12. Pomar,L.2001b,Types of carbonate platforms:a genetic approach:Basin Res.,v.13,p.313-334.

13. Romero,J.,E.Caus & J.Rosell.2002,A model for the palaeoenvironmental distribution of larger foraminifera based on late Middle Eocene deposits on the margin of the South Pyrenean basin(NE spain).Palaeogeography.Palaeoclimatology,Palaeoecology,179:43-56.

14. Romero,J.,E.Caus & J.Rosell,2004,Ecology of extant nummulitids and other larger benthic foraminifera: applications in palaeoenvironmental analysis,Earth-Science Reviews 67,p.219-265.

15. Schlager, W. (1992). Sedimentology and sequence stratigraphy of reefs and carbonate