Wojciech Kozłowski

• PhD
• University of Warsaw

The Cambrian rocks of the Palaeozoic inlier of the Holy Cross Mountains (HCM) in Poland offer a unique window into the sedimentary record on the margin of the Baltica palaeocontinent. The sedimentary features and ichnofossils in the upper part of the Cambrian Ociesęki Formation, which is a siliciclastic shallowing-upward succession exposed in the n...

Skompski, S., Kozłowska, A., Kozłowski, W. and Łuczyński, P. 2023. Coexistence of algae and a graptolite-like problematicum: a case study from the late Silurian of Podolia (Ukraine). Acta Geologica Polonica, 73 (2), 115-133. Warszawa. This contribution presents the record of an abundant assemblage of well-preserved, thallophytic noncalcified algae...

The middle and upper parts of the Skały Fm, Early to Middle Givetian in age, were investigated in four sections at Miłoszów Wood in the Łysogóry Region (northern region of the Holy Cross Mountains, central Poland). The dating is based on conodonts (Polygnathus timorensis Zone to the later part of the Polygnathus varcus/Polygnathus rhenanus Zone; ea...

Photosynthetically active foraminifera are prolific carbonate producers in warm, sunlit, surface waters of the oceans. Foraminifera have repeatedly developed mixotrophic strategies (i.e., the ability of an organism or holobiont to both feed and photosynthesize) by facultative or obligate endosymbiosis with microalgae or by sequestering plastids (kl...

The precipitation of both biotic and abiotic calcium carbonate is of great importance in modern and ancient global biogeochemical cycles. In the present-day oceans, the widespread precipitation of inorganic CaCO3 on the seafloor or in the water column is possible only under extraordinary circumstances. By contrast, in the geological record, authige...

Significance Most calcareous Paleozoic foraminifera have been traditionally assigned to one high-level taxonomic rank, Fusulinata, based on one common feature, a microgranular test texture. Unfortunately, this inorganic trait has not been sufficiently documented. These results show that Paleozoic foraminifera are taxonomically diverse as observed i...

Photosynthetically-active foraminifera are important carbonate producers contributing nearly 5 % of the reef and nearly 1 % of the total global calcium carbonate budgets. The abilities to be photosynthetically active, foraminifera realize by endosymbiosis with microalgae or by sequestering plastids (kleptoplasts) of digested algae. These ecological...

The mid-Ludfordian pronounced, positive carbon isotope excursion (CIE), coincident with the Lau/kozlowskii extinction event, has been widely studied so far in shallow-water, carbonate successions, whereas its deep-water record remains insufficiently known. The aim of this research is to reconstruct the sedimentary environments and the palaeoredox c...

The middle Homerian (Silurian) is widely described as a time of abrupt disturbances in oceanic conditions. One of the most significant anomalies occurring in this interval is the short-lived double-peaked positive carbon isotope excursion (CIE) documented from many sites all over the world. This geochemical event coincided with one of the most seve...

Vertebrate microremains from the upper Silurian Winnica Formation in the Holy Cross Mountains, Poland are described from the Winnica and Rzepin sections. Both sites record the uppermost part of the Słupianka Member, but represent different depositional environments. The Winnica samples come from a low-energy environment, while the Rzepin sample was...

The geological record of the mid-Homerian Mulde event in the deep-water settings of the East European Platform is characterized by a profound graptolite extinction event and a low amplitude positive δ¹³C excursion. It is also associated with a negative natural gamma excursion occurring in a monotonous shaly succession, visible on well logs and trac...

The paper summarises the effects of recent studies carried out by a team from the Department of Historical and Regional Geology of the Faculty of Geology, University of Warsaw on the upper Silurian of Podolia (western part of Ukraine). The sedimentary history of the Silurian succession of Podolia is characterised by its cyclic pattern, with shallow...

The mid-Ludfordian Carbon Isotope Excursion (CIE) is one of the biggest perturbation in the isotope and facies record in the Palaeozoic. However, its causes still remain unknown. In the periplatform setting of the Baltica palaeocontinent the event interval contains rock-forming minute calcite crystals, interpreted here as suspension-originated anal...

The term "re-flooding window" was recently proposed as a time-interval connected with the transgressive stage of present day peri-reefal development. In the analysis presented here, a fossil record of a re-flooding window has been recognized. Nine Late Silurian carbonate sections exposed on the banks of the Dnister River in Podolia (Ukraine) have b...

Tsunami deposits are currently a subject of intensive studies. Tsunamis must have occurred in the geological past in the same frequency as nowadays, yet their identified depositional record is surprisingly scarce. Here we describe a hitherto unrecognized example of probable palaeotsunamites. The Upper Silurian (Pridoli) carbonate succession of Podo...

The Ludlovian greywackes of the Holy Cross Mountains (HCM) represent a part of the sedimentary cover of the Lysogory and Matopolska terranes located in the Trans-European Suture Zone, central Poland. The rocks form the sedimentary infill of the Caledonian foreland basin that developed at the Tornquist margin of Laurussia and had source-areas locate...

The Homerian (middle Silurian) Mulde Event is an extinction event affecting hemipelagic organisms associated with a positive stable carbon isotope excursion, and an increased proliferation of microbial deposits. The Event is recorded in the Bagovytsya section (Podolia, Ukraine), representing a carbonate ramp setting in the East European Craton, and...

The Ludfordian (Upper Silurian) succession in Podolia, western Ukraine, represents a Silurian carbonate platform developed in an epicontinental sea on the shelf of the paleocontinent of Baltica. Coeval deposits throughout this basin record a positive stable carbon isotope excursion known as the Lau excursion. The record of this excursion in Podolia...

The graptolite-bearing upper Silurian succession of the Mielnik IG-1 borehole (eastern Poland) represents a periplatform setting on a neritic carbonate platform located on the palaeocontinent of Baltica and records widely recorded positive mid-Ludfordian Carbon Isotope Excursion (CIE). The initial increase of δ13C values occurs in the uppermost par...

The Ludlow deposits of the Winnica Formation in the Rzepin section (Holy Cross Mountains, Poland) have been studied with respect to their facies evolution and stable carbon isotope ratios from whole-rock samples. The C-isotope curve of the Rzepin section records a distinct positive excursion with maximal values of +8.9‰. A Late Ludlow positive isot...

The sedimentary history of stromatoporoid biostromal accumulations reflecting various depositional conditions (autoparabiostromes and parabiostromes) is studied in two isochronous, Late Silurian carbonate sections of the Malynivtsy Formation from Podolia (western Ukraine, Kam'janec' Podil'skyj area). This study focuses on morphometrical analysis of...

Three Late Silurian carbonate profiles of the Malynivtsy and Skala Formations from Podolia (western Ukraine) are discussed in terms of sedimentation dynamics. Their common feature is the appearance of thick, stromatoporoid-rich beds within fine-grained peritidal deposits. These intercalations are composed of fossils typical of offshore sedimentary...

The Ludlovian-Lochkovian succession of the Łysogóry Region of the Holy Cross Mountains (Central Poland) represents an infill of a Caledonian foreland basin situated at the SW margin of the East European Craton (EEC). The facies pattern and transport directions indicate that the source area was located westward from the basin and was separated from...

Study of geochemistry, examination of isotope ages of detrital minerals, palaeomagnetic analysis, and a study of the trilobites were performed to provide constraints on the palaeogeographical position of the Holy Cross Mountains in Late Ediacaran-Early Palaeozoic time. The geochemical results indicate an active continental margin or continental isl...

The uniform trace element characteristics, clast spectrum and age of detritus of the Ludlovian greywackes, known from Kielce and Łysogóry regions in the Holy Cross Mountains (HCM), indicate that the greywackes of both areas are of the same provenance. However, the petrofacial contrast between greywackes of both HCM regions, along with convergent tr...

Silurian land plants from the Holy Cross Mts. are described for the first time. The fossil assemblage occurs in a near− shore, marine, terrigenous deposit of Ludlowian/Pridolian age. It contains Cooksonia sp., Cooksonia−related species, and some problematical forms. The flora, which needs fur− ther study, is of importance to our understanding of ea...

The Brunovistulian (BVT) was one of the first tectonic unit of Central Europe to be defined as a "terrane". Good quality paleomagnetic data obtained from thick series of red beds suggest a nearly equatorial position of this unit in the Early Cambrian. It occupied most probably position within the Cadomian belt between present-day Tunisia and Turkey...

KOZ¸OWSKI, W. 2003. Age, sedimentary environment and palaeogeographical position of the Late Silurian oolitic beds in the Holy Cross Mountains (Central Poland). Acta Geologica Polonica, 53 (4), 341-357. Warszawa. A thin sandy-oolitic formation [Jadowniki Formation (JF)] is described from the Upper Silurian of thysogóry Unit, Holy Cross Mountains (C...

In the Bardo Syncline in Zalesie near Lagow, there occur numerous assemblages of benthic fauna which correspond to a fauna from Gruchawka and Jurkowice. The predominant trilobite group occurs with graptolites of the Bohemograptus bohemicus Zone. The Niewachlow Greywackes, and other deposits corresponding to them in the Holy Cross Mountains containi...