Platon Tchoumatchenco

Geological Institute BAS · Paleontology, stratigraphy, lithology

We describe here the life and career of geologists who beyond their nationality (Russian, Ukrainian, Tatar, German, etc.), were born on the territory of the Russian Empire, the Soviet Union or the Russian Federation and their descendants that became geologists, all of whom lived and worked in Latin-American countries (where Spanish and Portuguese l...

In the Bulgarian and Serbian geological literatures, many maps, both geological and tectonic, exist showing the structures, but limiting them nationally. There are very few publications correlating the structures from both sides of the border and they preserve the local Bulgarian or Serbian names. Our aim is to create a base for the unification of...

Herein, correlations of the Jurassic sediments from NE Serbia with those of NW Bulgaria are made. The following Jurassic palaeogeographic units: the Eastern Getic, the Infra-Getic and the Moesian Platform are included in the study. The East Getic was studied in the outcrops near Rgotina, where the sedimentation started in the Hettangian and continu...

During the Jurassic the big palaeogeographic units around the places of the present-day Serbian/Bulgarian border were: the Serbo-Macedonian-Thracian Massif, the Supra-Getic, the Getic, the Infra-Getic and the Moesian Platform. The Serbo-Macedonian-Thracian Massif represented a dry land, source area for the Jurassic seas. The Supra-Getic was the are...

During the Jurassic the big palaeogeographic units around the Serbian/Bulgarian border were the Serbo-Macedonian-Thracian Massif, the Supra-Getic, the Getic, the Infra-Getic and the Moesian Platform. The Serbo-Macedonian-Thracian Massif represented a dry land, source area for the Jurassic seas. During the Early Jurassic the Supra-Getic had been als...

The Lower Jurassic rocks in Eastern Stara Planina Mts. are of two types: shelf and basin. The shelf sediments are limestones, sedimentary allochtonous, redeposited in the basin as olistolites and/or conglomerates; the basin sediments are relatively deeper marine water (tectonically allochtonous), represented by siliciclastic ysch alternation { Sin...

The Getic and Supra-Getic are palaeogeographic units in SE Serbia and SW Bulgaria. Based on the presence (in Eastern) or absence (in Western) of Lower Jurassic marine deposits, the Getic is divided into Eastern and Western. In the Eastern Getic, the Lower Jurassic sedimentation in SE Serbia is represented by the Vidlič Clastites covered by the Luka...

The Getic and Supra-Getic are palaeogeographic units in SE Serbia and SW Bulgaria. Based on the presence (in Eastern) or absence (in Western) of Lower Jurassic marine deposits, the Getic is divided into Eastern and Western. In the Eastern Getic, the Lower Jurassic sedimentation in SE Serbia is represented by the Vidlič Clastites covered by the Luka...

The Jurassic System in the West Balkan Mountains attracted the attention of the first scholars of geology and stratigraphy in Bulgaria F. Toula and V. Zlatarski more than 100 years ago. The intense field, palaeontological and stratigraphical studies of the Upper Jurassic and Lower Cretaceous pelagic carbonates in the Izdremets Syncline led to the l...

Palaeobiogeography plays an important role in the evolution of continental plants. This has been demonstrated mainly for modern biota and for past biota on a very large scale only. During the Jurassic–Early Cretaceous Mid-Eastern Europe was an archipelago, thus a particularly suitable area for a more detailed study. We investigated the area's plant...

In the region across the Serbian/Bulgarian state border, there are individualized 5 Jurassic paleogeographic units (from West to East): (1) the Thracian Massif Unit without Jurassic sediments; (2) the Lužnica-Koniavo Unit - partially with Liassic in Grsten facies and with deep water Middle Callovian-Kimmeridgian (p. p) sediments of the type "ammoni...

The Infra-Getic Unit is a palaeogeographic unit, predestined by palaeotectonics. From the point of view of geological heritage, it represents a geosites framework. For the purpose of the correlation, the Serbian sections of Lukanja, Bogorodica Monastery, Rosomač and Senokos, as well as the Bulgarian sections of Komshtitsa, Gintsi, and Stanyantsi we...

In the region across the Serbian/Bulgarian state border, there are individualized 5 Jurassic paleogeographic units (from West to East): (1) the Thracian Massif Unit without Jurassic sediments; (2) the Lužnica-Koniavo Unit - partially with Liassic in Grsten facies and with deep water Middle Callovian-Kimmeridgian (p. p) sediments of the type "ammoni...

The onset of the Jurassic sedimentation in the region of Pernik (southwestern Bulgaria) is at the end of Bajocian with deposition of sandstones (Lyalintsi Mem- ber of Gradets Fm.) and continuing during the Bathonian with bioclastic limestones (Polaten Fm.). The section Staro selo is one of the most complete Jurassic sections in Southwest Bulgaria....

The Sinivir Formation (Fm.) was introduced as official lithostratigraphic unit by ×óìà÷åíêî & ×åðíÿâñêà (1989) for an alternation of sandstones and mudstones, lying below the Balaban and Kotel Fm. These rocks were individualized for the first time by Berndt (1934) as "Schieflysch", later described by Ãàíåâ (1961) as Senonian flysch, and by Êúí÷åâ &...

Introduction The study of the Triassic and Jurassic rocks in Eastern Stara Planina Mts. started in the beginning of the 20th century. Kockel (1929) and Bernd (1934) already demonstrated that a large number of Triassic and Jurassic outcrops represented huge exotic blocks (later named olistolites), and this view has been entirely or partially shared...

Two types (basin and shelf) of Triassic and Jurassic Tethyan sediments participate in the structure of eastern Stara Planina Mts. (eastern Bulgaria). A parautochthonous position is assumed for the basin type rocks. The shelf sediments are allochthonous and can be observed as olistolites included in the Lower Jurassic Sini Vir Formation and in the M...

Deep-sea trace fossils of the Nereites ichnofacies occur in the uppermost Kimmeridgian–Berriasian deep-water turbidite deposits of the Kostel Formation in SW Bulgaria. The trace fossil assemblage contains Tithonian Ophiomorpha isp. and Ophiomorpha annulata, which are the oldest deep-sea representatives of this ichnogenus. They indicate much older i...

As a result of the biostratigraphic study of brachiopods, bivalves and ammonites made in eight instructive sections it was established that most of the Lower Jurassic rock sequences were more or less incomplete. The sections in the valleys of the rivers Kostina and Cherna Reka, Teteven Region, are most complete (from Hettangian to Toarcian). They a...

During the Jurassic the northern parts of the territory of Bulgaria represented parts of the southern margin of Eurasia-Moesian platform. In south of Moesia existed a fragment—the Thracian plate, which in east prolonged in the exotic ridge of Zlatarski and the hypothetic land of Euxinia (South of Crimea in the Black Sea). In NW direction the Thraci...

The Moesian Platform was built during the Early and Middle Jurassic by few block structures - grabens and horsts. It subsided slowly, which controlled a progressive marine transgression. During the Late Callovian and the Late Jurassic a considerable reorganisation in the structure of the platform began. Three big blocks were differentiated, and nam...

Detailed biostratigraphical study (on brachiopods, bivalves and ammonites) on seven sections established that some of them are complete, while the others are more or less incomplete. The reason for this is the gradual marine Early Jurassic transgression which occurred during the Hettangian and later. Locally the marine transgression had been preced...

The Middle Jurassic deposits in western Bulgaria represent a full sedimentary cycle including a transgression (sandy sediments without brachiopods), shallow-water carbonates (with brachiopods) followed by deep-water deposits (without brachiopods) or by a break in sedimentation. They have been divided into six brachiopod zones: (1) a zone of Acantot...

During the Early-Middle Jurassic Central North Bulgaria belonged to the Moesian Early-Middle Jurassic Platform. Even as early as the Hettangian it gradually started sinking. As a result of this a marine ingression started over its lowermost grabens. Within limited areas the marine ingression was preceded by continental accumulation of swamp and lak...

A reconstruction of the palaeogeographic environment during the deposition of the Lower Jurassic sediments indicates the existence of a turbidite trough infilled with proximal sediments (forming the deep-sea Hadzievdol Fan Delta) and distal basin turbidites. This trough originated as a result of extension during the Pliensbachian and Toarcian. Sout...

Brachiopod biotopes are recognized in the Early Jurassic rocks of Bulgaria. The geographical distribution of these is plotted for each of the stratigraphical zones determined earlier on the basis of brachiopods. The biotopes are related in turn to bathymetry, energy level and bottom type.

Fossil orientations and the mode of preservation of brachiopod shells are recorded from the Early Jurassic rocks of central and western Bulgaria. A direct correlation is found between them. Palaeocurrents are shown to have been generally from south to north, with local variations.From the statistical study of the results of orientation measurements...

The Triassic and Jurassic sediments in East Stara Planina Mts. are of two types: (a) parautochtonous - relatively deep marine sediments, Tethyan type, and (b) allochtonous - shallow marine deposits, Peri-Tethyan type (included in the first as olistolites). The parautochtonous type had been sedimented in unilateral rift-basin, and the allochtonous t...