DEM-based structural mapping: examples from the Holy Cross Mountains and the Outer Carpathians, Poland
KONON A., SMIGIELSKI M.
Institute of Geology, University of Warsaw, Al. Zwirki i Wigury 93, PL-02-089 Warszawa, Poland
Andrzej.Konon@uw.edu.pl
M.Smigielski@uw.edu.pl
ABSTRACT: The study of the Earth's surface using DEM-generated products combined with geological maps or satellite
and aerial photographs provides information that is very useful for structural analysis. Applications of shaded-relief images, slope, openness,
and aspect maps, 3D terrain views, profiling, contouring and semiautomatic intersections to selected parts of the Holy Cross Mountains and the
Bieszczady Mountains are shown. The analysis led to the discovery of transverse faults in both fold and thrust belts, determination of the
components of movement along these faults and the courses of the Lysogory fault zone and the Dukla thrust fault. The application of these
methods also enabled the display of changes in shape profiles of map-scale folds such as the Niewachlów anticline and the Baligród syncline.
Return to: AGP Homepage | Table of Contents | Top
 |
The middle-upper Cenomanian of Zilly (Sachsen-Anhalt, northern Germany) with remarks on the Pycnodonte Event
WILMSEN M.1, VOIGT T.2
11Institut fur Palaontologie, Bayerische Julius-Maximilians-Universitat, Pleicherwall 1, D–97070 Wurzburg, Germany.
m.wilmsen@mail.uni-wuerzburg.de
2Institut fur Geowissenschaften der Friedrich-Schiller-Universitat, Burgweg 11, D–07749 Jena, Germany.
Thomas.Voigt@uni-jena.de
ABSTRACT:A detailed stratigraphic log of the 28 m thick Cenomanian succession at Zilly
(Sachsen-Anhalt) is presented. The succession
is composed of 11 m of middle Cenomanian hemi-pelagic marl–limestone alternations
(‘Pläner Limestones’) grading
into 15 m of upper Cenomanian calcareous pelagites (‘Poor rhotomagense Limestones’)
unconformably overlain by 1.5
m of red-coloured marly clays and limestones (‘Rotpläner’).
The proof of the interregional marker beds of the Pycnodonte Event at
the 11 m level, the Facies Change at 26 m, and the base of the plenus Bed at
26.9 m allow a bio-/chronostratigraphic
correlation of these levels with the middle/upper Acanthoceras jukesbrownei Zone
(upper middle Cenomanian), the Calycoceras (Proeucalycoceras) guerangeri/Metoicoceras
geslinianum Zone transition,
and the lower Metoicoceras geslinianumZone, respectively (middle upper Cenomanian). Litho-/microfacies and sequence
stratigraphic analyses indicate
an overall increase of pelagic influence up to the Facies Change. This retrogradational
trend was shortly interrupted by the
Pycnodonte Event, the base of which correlates with the late middle Cenomanian
sequence boundary SB Ce IV and the
succeeding transgressive surface. The Facies Change indicates a significant mid-late
Cenomanian sea-level fall (sequence
boundary SB Ce V), followed by more shallow water Rotpläner deposition.
The Pycnodonte Event is very thick and proximal
in character at Zilly. Its monospecific oyster fauna consists of small pycnodonteines
assigned to Pycnodonte (Phygraea)
vesicularis (LAMARCK) vesiculosa (J. SOWERBY), a secondarily free-lying oyster
which lived as a ‘cup-shaped recliner’. The
patchy occurrence of the oysters, the sorting and partial damage of valves prior
to final burial along with significant supply
of terrigenous materials suggest episodically elevated water energy and strong
environmental stress during deposition of
the Pycnodonte Event. This situation promoted colonization of the sea-floor by,
and reproductive success of the inferred
eurytopic oyster. The Pycnodonte Event is a classic example of an ‘onlapping
bioevent’, the formation of which was controlled
by different factors such as sea-level rise, terrigenous influx, environmental
stress, and preferential preservation.
Return to: AGP Homepage | Table of Contents | Top
|
Correlation of the zonal schemes at the Middle - Upper Oxfordian (Jurassic) boundary in the Submediterranean Province: Poland and Switzerland
GLOWNIAK E.
Institute of Geology, University of Warsaw, Al. Zwirki i Wigury 93, PL- 02-089 Warsaw, Poland.
glowniak_ek@uw.edu.pl
ABSTRACT:Definition of the Oxfordian Elisabethae Subzone of the upper Transversarium
Zone, and the Wartae Subzone, is provided. The Wartae Subzone has been absorbed
into the overlying Bifurcatus Zone as a basal Subzone. The redefined base
of the Bifurcatus Zone lies somewhat below the lower boundary of the Bifurcatus
Zone of CARIOU & al. (1997). The boundary between
the redefined Transversarium and Bifurcatus zones is now the boundary between
the Submediterranean Middle and Upper Oxfordian. Correlation between the zonal
schemes of Poland and Western Europe is established by means of the intermediate area of northern Switzerland,
where the indexes of the zonal schemes co-occur. The lower boundary of the Wartae Subzone of the Bifurcatus
Zone in Poland is approximately coeval with the lower boundary of the Schilli
Subzone and Zone in Switzerland. The overlying Rotoides Subzone correlates
with the upper part of the Wartae Subzone in Poland. Description of topotypes
of Perisphinctes (Dichotomoceras) wartae from Czestochowa, and the accompanying macroconch
species, is provided.
Return to: AGP Homepage | Table of Contents | Top
|
Late Glacial and Holocene lacustrine molluscs from Wielkopolska (central Poland) and their environmental significance
APOLINARSKA K., CISZEWSKA M.
Institute of Geology, Adam Mickiewicz University, Makow Polnych 16, PL-61-606 Poznan, Poland.
karinaap@amu.edu.pl
ABSTRACT:
Late Glacial and Holocene lacustrine molluscs occurring in three sites from
the Gniezno and Poznan Lake Districts in central Poland are described.
The mollusc fauna present in the sites is composed mainly of aquatic species
with an accessory content of terrestrial snails inhabiting damp or very damp,
periodically flooded sites. Ecological preferences of species, changes in their
composition and frequency together with shell
dimensions are used as indicators of palaeoenvironment and palaeoclimate.
Infrequent shells present in the Imiolki and Rybitwy sites are small and thin-walled
in consequence of the cold climate prevailing in the Late Glacial when the
sediments in question were deposited. In the Imiolki site Pisidium lilljeborgii CLESSIN,
a species indicative of low temperatures, occurs. Deposits in the Niepruszewo-Ciesle
site were accumulated through most of the Holocene, thus warmer conditions resulted
in considerably more abundant and larger shells with thicker walls.
Return to: AGP Homepage | Table of Contents | Top
|
Latest Albian (Vraconian) brachiopod fauna from North Dobrogea (Romania): taxonomy, palaeoecology and palaeobiogeography
GRADINARU E.1, BARBULESCU A.1, OWEN E. F.2
1Department of Geology and Palaeontology, Faculty of Geology and Geophysics, University of Bucharest, Bd. Balcescu Nicolae 1, RO-010041 Bucharest, Romania.
egradin@geo.edu.ro
2Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, Great Britain.
ABSTRACT:The latest Albian (Vraconian) brachiopod fauna from Enisala, in North Dobrogea,
includes representatives of rhynchonellids and terebratulids. The rhynchonellids
are scarce, representing two families, Cyclothyrididae and Tetrarhynchiidae.
The Cyclothyrididae with the subfamily Cyclothyridinae, and
the Tetrarhynchiidae with the subfamily
Cretirhynchiinae, are represented by rare specimens of ? Cyclothyris sp.
and
Burrirhynchia cf. sigma (SCHLOENBACH,
1867), respectively. The terebratulids are very abundant and include representatives
of several families, as follows:
Sellithyrididae, Capillithyrididae, Cancellothyrididae and Terebrataliidae.
The Sellithyrididae, which make up the bulk
of the assemblage, are represented by two subfamilies: Sellithyridinae with
Sellithyris upwarnesis (WALKER, 1870), Boubeithyris
boubei (D’ARCHIAC, 1847) and Ovatathyris cf. potternensis OWEN,
1988, and Nerthebrochinae with Harmatosia crassa (D’ARCHIAC,
1847). The Capillithyrididae are represented by the subfamily Capillithyridinae
with Capillithyris capillata (D’ARCHIAC,
1847). The Cancellothyrididae are represented by the subfamily Cancellothyridinae with
numerous specimens of Terebratulina protostriatula OWEN,
1988. The Terebrataliidae are represented by the subfamily
Gemmarculinae with scarce specimens of Gemmarcula canaliculata (ROEMER,
1840) and Gemmarcula sp.
The abundance and diversity of the terebratulids in the brachiopod assemblage
from Enisala was related to favourable environmental conditions connected
with the onset of the marine transgression on North Dobrogea during the latest
Albian. There is a marked stratigraphic lag with some species which in North
Dobrogea
occur in the latest Albian appearing in the Early Cenomanian in Central and Western Europe. This suggests that North
Dobrogea was located on the
main route of the westward migration of the mid-Cretaceous brachiopod faunas.
Return to: AGP Homepage | Table of Contents | Top
|
Middle Miocene coralgal facies at Maksymivka near Ternopil (Ukraine): A preliminary account
RADWANSKI A., GORKA M., WYSOCKA A.
Institute of Geology, Warsaw University, Al. Zwirki i Wigury 93, PL-02-089 Warszawa, Poland.
Anna.Wysocka@uw.edu.pl
ABSTRACT: A peculiar coralgal facies is recognized in the Lviv-Ternopil region, Ukraine,
from the northern shores of the Middle Miocene (Badenian) Fore-Carpathian
Basin. Its complex structure is dominated by algal buildups composed of interfingering red-algal (lithothamnian) colonies and blue-green-algal crusts,
associated locally with numerous hermatypic corals (Tarbellastraea reussiana, Porites vindobonarum prima),
either isolated, or overlapping each other. The holes amidst, and the crevices
in, the buildups are filled with coarse bioclastic sediment (shell-grit), burrowed
commonly by crustacean decapods (alpheid shrimps). The alpheid burrows, filled with
coarser or finer shell-grit, served
frequently as taphonomic traps for crustacean decapods (squat lobsters and
crabs) and echinoids. Special attention is
paid to the activity of rock-boring bivalves (Jouannetia semicaudata, Lithophaga
lithophaga) in coralgal buildups and/or in particular coral colonies,
some of which are redeposited, and riddled densely by bivalve borings. Emphasis
is given to the environmental significance of alpheid shrimps, the tiered
burrows of which are recorded in the Fore-Carpathian Basin for the first time.
Crustacean decapods and echinoids are systematically studied. A comparison
of the studied coralgal facies with others of the Lviv-Ternopil region, and
those from the territory of Poland, indicates their faunistic and biogeographic
identity.
Return to: AGP Homepage | Table of Contents | Top
|
Stratigraphy, petrography and palaeogeographic significance of the Early Oligocene "menilite facies" of the Tarcau Nappe (Eastern Carpathians, Romania)
PUGLISI D.1, BADESCU D2, CARBONE S.1, CORSO S.3, FRANCHI R.4, GIGLIUTO L.G.1, LOIACONO F.5, MICLAUS C.6, MORETTI4
1Dipartimento di Scienze Geologiche, University of Catania (Italy), Corso Italia 55, I-95129 Catania (Italy)
dpuglisi@unict.it
carbone@unict.it
geolisa@infinito.it
2University of Bucharest, N. Balcescu Bd., nr. 1, sector 1, Bucharest, Romania.
dbadescu@geo.edu.ro
33I. A. M. C. – C. N. R. (Istituto per l’Ambiente Marino Costiero – Consiglio Nazionale delle Ricerche), Sezione I. R. M. A.
(Istituto di ricerche sulle Risorse Marine e l’Ambiente), via Luigi Vaccara, 61, I-91026 Mazara del Vallo (TP), Italy.
s.corso@uniurb.it
4Istituto di Geologia, University of Urbino (Italy), Campus Universitario, Loc. Crocicchia, I-61029 Urbino, Italy.
r.franchi@geo.uniurb.it
elviomoretti@tin.it
5Dipartimento di Geologia e Geofisica, University of Bari (Italy), Campus Universitario, Via E. Orabona, 70100 – Bari (Italy)
loiacono@geo.uniba.it
6Departamentul de Geologie, "Al. I. Cuza" University of Iasi, Bd. Carol, I, 20A, 6600, Iasi, Romania.
crinami@ambra.ro
ABSTRACT: The analyzed “menilite facies” (Early Oligocene Lower Menilites
of the Tarcau Nappe, Romanian Carpathians, formed by “
bedded cherts” and black shale-like deposits), document the upward evolution
of a mainly turbiditic sequence. The stratigraphical relationships with the
underlying turbidites are marked by a sudden and sharp transition to a predominantly
pelitic menilite-bearing succession, probably as a consequence of a drastic
decrease in the terrigenous supply. This type of sedimentation ceased at the
Rupelian-Chattian boundary, when new turbiditic flows occurred. The multi-source
provenance characterizing the basal turbidites (quartzarenite and litharenite
sandstones which were probably derived from external cratonic areas and from
inner crystalline belts respectively), is here interpreted as closely linked
to tectonically induced palaeogeographic modifications. This hypothesis is
in agreement with literature data, which relate these “menilite facies” to
an Eocene-Oligocene widespread anoxic event that occurred in the western and
central Paratethys, linked to drastic palaeogeographical modifications and
to a global climatic deterioration. These palaeogeographical modifications
may have corresponded to the Paleogene microplate reorganization and progressive
exhumation of the Alpine-Dinaric-Balkan fold-thrust belt, which was responsible
for the increasing isolation of the Paratethian basin from the World Ocean.
Early Oligocene cooling events, consequent stratification of different salinity
water layers and/or upwelling currents, could have produced anoxic conditions at the bottom of the flysch basin and the deposition of the “menilite
facies”.
Return to: AGP Homepage | Table of Contents | Top
|
