Science and earth science

Acta Geologica Polonica


Acta Geologica Polonica | 2018 | vol. 68 | No 2

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The Telbesmi Formation, at the northern margin of the Arabian Plate, Turkey, is composed of alternating darkbrown,

pinky-brown fluvial arkosic sandstone/mudstones with thin-bedded cherty limestones and channel

conglomerates. The formation contains rare and poorly diversified trace fossils. The siltstone/sandstone beds of

levels 1 and 2 of the formation yielded, however, a moderately diverse assemblage composed of: Cochlichnus

isp., Palaeophycus isp., Planolites beverleyensis, Teichichnus isp. and ?Treptichnus rectangularis. This assemblage,

made up of traces left by deposit feeding organisms, represents the Scoyenia ichnofacies. Treptichnus

rectangularis and Palaeophycus isp., of the assemblage, can be considered markers for the base of the Cambrian

in southeast Turkey.

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Authors and Affiliations

Huriye Demírcan
Semih Gürsu
M. Cemal Göncüoğlu
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The long-ranging Early to Middle Triassic coniform conodont form-genus Cornudina Hirschmann occurs

abundantly in the Anisian of NW Turkey, Northern Tethys. Although suggested to represent the P1 element

of an apparatus of the Order Ozarkodinida Dzik, questions concerning the apparatus of Cornudina remain.

A description of the probable phylogenetic trends in the P1 elements of Cornudina is attempted and the role

of the form-genera Ketinella Gedik and Kamuellerella Gedik, as the alternative ramiform skeletal elements in

the Cornudina multi-element apparatus, is investigated. The newly described, Gedikella quadrata gen. nov.,

sp. nov., is an S element, Kamuellerella rectangularis sp. nov., is either an S3 or an S4 element, and Ketinella

goermueshi sp. nov., is an M element.

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Authors and Affiliations

Ali Murat Kılıç
Pablo Plasencia
Fuat Önder
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The Upper Greensand Formation, mostly capped by the Chalk, crops out on the edges of a broad, dissected

plateau in Devon, west Dorset and south Somerset and has an almost continuous outcrop that runs from the Isle

of Purbeck to the Vale of Wardour in south Wiltshire. The Formation is well exposed in cliffs in east Devon and

the Isle of Purbeck, but is poorly exposed inland. It comprises sandstones and calcarenites with laterally and

stratigraphically variable amounts of carbonate cement, glauconite and chert. The sedimentology and palaeon-

tology indicate deposition in marginal marine-shelf environments that were at times subject to strong tidal and

wave-generated currents. The formation of the Upper Greensand successions in the region was influenced by

penecontemporaneous movements on major fault zones, some of which are sited over E-W trending Variscan

thrusts in the basement rocks and, locally, on minor faults. Comparison of the principal sedimentary breaks in

the succession with the sequence boundaries derived from world-wide sea-level curves suggests that local tec-

tonic events mask the effects of any eustatic changes in sea level. The preserved fauna is unevenly distributed,

both laterally and stratigraphically. Bivalves, gastropods and echinoids are common at some horizons but are

not age-diagnostic. Ammonites are common at a few stratigraphically narrowly defined horizons, but are rare

or absent throughout most of the succession. As a result, the age of parts of the succession is still poorly known

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Authors and Affiliations

Ramues Gallois
Hugh Owen
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In the Polish sector of the Magura Nappe have long been known and exploited carbonate mineral waters, saturated

with carbon dioxide, known as the “shchava (szczawa)”. These waters occur mainly in the Krynica Subunit

of the Magura Nappe, between the Dunajec and Poprad rivers, close to the Pieniny Klippen Belt (PKB). The

origin of these waters is still not clear, this applies to both “volcanic” and “metamorphic” hypotheses. Bearing

in mind the case found in the Szczawa tectonic window and our geological and geochemical studies we suggest

that the origin of the carbon dioxide may be linked with the thermal/pressure alteration of organic matter of the

Oligocene deposits from the Grybów Unit. These deposits, exposed in several tectonic windows of the Magura

Nappe, are characterized by the presence of highly matured organic matter – the origin of the hydrocarbon accumulations.

This is supported by the present-day state of organic geochemistry studies of the Carpathian oil and

gas bed rocks. In our opinion origin of the carbon-dioxide was related to the southern, deep buried periphery of

the Carpathian Oil and Gas Province. The present day distribution of the carbonated mineral water springs has

been related to the post-orogenic uplift and erosion of the Outer (flysch) Carpathians.

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Authors and Affiliations

Nestor Oszczypko
Patrycja Wójcik-Tabol
Marta Oszczypko-Clows
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The Maastrichtian sediments of northern Iraq are rich in larger benthic foraminifera. Among them, the genus

Loftusia is well-known one because of its significant palaeogeographic distribution across the Mediterranean

and Middle East. In this study, observations of abnormal test shapes, species recognition criteria and endoskeleton

characteristics of Loftusia are discussed, based on the new material from north-eastern Iraq. The following

species of Loftusia are described: Loftusia elongata Cox, L. persica Brady, Loftusia morgani Douvillé, L. anatolica

Meriç, L. matsumarui Meriç and Görmüs, L. minor B Cox, L. ketini B Meriç and L. kahtaensis Meriç,

Loftusia minor A Cox, L. oktayi Meriç and L. baykali Meriç. The predominant species are Loftusia elongata,

L. morgani and L. baykali. Skewed abnormal individuals and epidermal parts of the endoskeleton structure are

also interesting aspects to note. Quantitative data obtained for Loftusia allow us to better understand and interpret

species identification criteria, abnormal occurrences and the endoskeleton structure.

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Authors and Affiliations

Muhittin Görmüş
Qahtan A.M. Al Nuaimy
Fadhil A. Ameen (Lawa)
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Early Palaeocene through early Eocene silicoflagellate assemblages were examined from five southern subtropical

through subpolar deep-sea sites: DSDP Holes 208 and 524, and ODP Holes 700B, 752A, and 1121B. For each

site, the taxonomic composition of the silicoflagellate assemblage is documented in detail; Pseudonaviculopsis

gen. nov., Dictyocha castellum sp. nov. and Stephanocha? fulbrightii sp. nov. are proposed, along with several

new combinations. More importantly, however, these observations enable a considerable refinement to the existing

Palaeocene–Eocene silicoflagellate biostratigraphic zonation that for the first time uses datums calibrated to

the Geomagnetic Polarity Timescale. The Corbisema aspera Interval Zone occurs immediately above the K/Pg

boundary and is here described from Seymour Island. The Corbisema hastata Partial Range Zone extends from

near the K/Pg boundary to late early Palaeocene and has been observed in Hole 208. The Pseudonaviculopsis disymmetrica

Acme Zone occurs in Holes 208 and 700B. The Dictyocha precarentis Partial Range Zone, observed

in Holes 208, 700B, 752A and 1121B, is subdivided into D. precarentis, Naviculopsis primativa, N. cruciata

and Pseudonaviculopsis constricta subzones. The Naviculopsis constricta Partial Range Zone occurs in Holes

524, 700B, 752A and 1121B. This study is also the first to consider syn- and/or diachroneity in Palaeogene

silicoflagellate biostratigraphy.

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Authors and Affiliations

Kevin McCartney
Jakub Witkowski
Adriana Szaruga
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The S-7 borehole log from the Sumina area (USCB Poland) revealed the presence of three basaltic veins

originating from a basalt dyke. Coal interlayers in the rocks surrounding the basaltic veins have been coked to

form natural coke. Photometric measurements revealed that the optical properties of the studied natural coke

samples are characteristic of semi-graphite (Rmax > 9%). The natural coke matrix of all of the analyzed samples

has a biaxial negative optical character. Vitrinite in the examined natural coke samples is characterized by a

lower optical anisotropy than that of the natural matrix and it has a biaxial positive optical character. Vitrinite

in almost all samples taken at locations more distant from the intrusion has a biaxial positive optical character.

A reversal of the changes of the true maximum vitrinite reflectance and bireflectance with changing distance

from the second basaltic vein has been observed. The temperature regime that acted upon the dispersed organic

matter located in the immediate vicinity of the intrusion, estimated on the basis of the selected experimental

data, is suggested to be higher than 750 °C.

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Authors and Affiliations

Zdzisław Adamczyk
Magdalena Kokowska-Pawłowska
Joanna Komorek
Agnieszka Klupa
Małgorzata Lewandowska
Jacek Nowak

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