Eichenallee 141

Gütersloh, Germany

Eichenallee 141

Gütersloh, Germany
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Wulff L.,Ruhr University Bochum | Kaplan U.,Eichenallee 141 | Mutterlose J.,Ruhr University Bochum
Geologie und Palaeontologie in Westfalen | Year: 2017

The depositional history and the nowadays spatial distribution of Late Cretaceous sediments in northern Germany was partly controlled by eustatic sea-level changes and regional tectonics. Subsequent phases of subsidence, uplift and reworking caused a complex distribution pattern. Following a eustatic sea-level rise in the early Late Cretaceous (Cenomanian, Turanian), which caused a flooding of the Münsterland Basin, northern Germany experienced an inversion in the mid Late Cretaceous (Coniacian, Santonian). The area north of the Münsterland Basin, the Lower Saxony Basin, underwent uplift along a large fault zone (Osning Fault). At the same time the Münsterland Basin, positioned south of the Teutoburger Wald, subsided and formed a major depositional centre for sediments supplied by the uplifted area in the north. Predominant erosion occurred in the western part of the Lower Saxony Basin, the nowadays Osnabrücker Bergland. The mid Late Cretaceous successions, which were deposited next to the fault zone, are associated with submarine slides during the inversion phase. These presumably occurred during the Turonian-Coniacian. The Halle/Hesseltal quarry 14 km northwest of Bielefeld offers a unique opportunity to study these slides. Two different submarine slides and two turbidite deposits from four localities have been sampled in the Hesseltal quarry. For the first time calcareous nannofossils have been analysed to obtain reliable ages of the reworked units. The results show a middle Turanian age (nannofossil zone UC9a) for the reworked boulders (phacoids) and a middle Coniacian age (nannofossil zone UC10) for their surrounding matrix. Reworked Cenomanian material has been recognized in three of the four sampled intervals. The data are used to derive to hypotheses to estimate the timing and the rates of erosion in the uplifted area north of the Münsterland Basin. The uplift most likely started in the late middle or early late Turanian.

Lubke N.,Ruhr University Bochum | Kaplan U.,Eichenallee 141 | Mutterlose J.,Ruhr University Bochum
Geologie und Palaeontologie in Westfalen | Year: 2015

The successions of marine upper Turanian sediments from the Münsterländer Kreidebecken are punctuated by four thin volcanic ash-layers, three of which are subject to this study. Traditionally, these horizons are dated by ammonite and inoceramid biostratigraphy. In this study, calcareous nannofossils from the ash-layers are used for the first time to gain additional biostratigraphic information. In addition, a quantitative analysis of the nannofossil assemblages is applied in order to obtain data of the ecology of the ash-layers. A total of 28 samples from the ash-layers D, E and F and the intercalated marls have been collected from three outcrops (Halle, Westfalen - Dissen - Bad Laer) and studied for nannofossils. Each ash-layer has been sampled in high resolution with at least three samples per layer. Ash-layer D is assigned to nannofossil-zone UC 9b, layer E is located at the UC 9b - UC 9c - boundary, and layer F is assigned to zone UC 9c. The nannofossil assemblages within the ash-layers differ from those of the marls by the abundance patterns of Zeugrhabdotus and Helicolithus. All three ash-layers show lower abundances of high productivity species. Nannofossils are a useful tool to distinguish the ash-layers D, E and F. Despite the high-resolution sampling of the ash-layers, no changes in nannofossil assemblage composition within the ash-layers were detected. The impact of the volcanic activity on the nannofossil assemblages was low.

45 exposures of the Oerlinghausen and the Salder Formation including the Soest-Greensand Subformation, Middle-and Upper Turanian (Upper Cretaceous), of Paderborn plateau and Haarstrang between Borchen and Anröchte, southeastern Munster Basin, are described by means of existing litho-, bio-and event stratifications and their faunal contents. The Oerlinghausen Formation consists of bedded light grey marly limestones with centimetre to decimetre thick intercalated marls. The Soest-Greensand Subformation substitutes the basal Salder-Formation. It is built by moderate sandy and glauconitic horizons of marly limestones 2-3 metres thick, with the exception of the extreme east of the working area. The overlaying Salder Formation consits of thick beds of white to light grey marly limestones with intercalated thin marl seams and only few layers of clay and marl up to 50 centimetres thick. Where as in the west of the working area the Salder Formation and the overlaying lower Erwitte Formation are condensed to a package of approximately 4.5 metres, in the east it is closely connected with completely developed sequences of southeastern Teutoburger Wald. The Upper Turanian Alme Greenstone (Alme Grünstein), described here for the first time, is distributed in the realm of Borchen - Salzkotten-Niedertudorf, and occurs between Mcraster-Event and basis of Grauweiße Wechselfolge, subformation of Erwitte Formation. Its beds consit of hart marly limestone, and are glauconitic and a little sandy. These beds were correlated with the Soest Greensand Subformation so far. The Middle Turanian closely correlates with occurrences of Teutoburger Wald by means of bio-and event stratigraphy. In contrast, the base of the Upper Turanian can be located only be lithostratigraphy. The sections up to the base of the Soest Greensand Subformation are to a large extent barren of fossils. The freestone horizons of the Soest Greensand Subformation are Subprionocyclus neptuni-Zone and can be correlated with the section from marl MEto Hyphantoceras-Event In the western working area, the Turanian Coniacian boundary lays approximately 2 metres above the freestone horizons of the Soest Greensand Subformation. In the eastern working area, the boundary lays 35 metres higher.

The quarry of Bishop Meinwerk, 11th century, lays in the city centre of Paderborn. It was archaeologically excavated in 2005 and 2006. It is an unique monument of engineering history which gives insights into medieval quarry operation. It is documented be means of geology and palaeontology, and correlated with regionally outcropping formations. For this purpose the position of small quarries at the southern periphery, which existed up to the end of the fifties, is determined. With this goes along the location of the type localities of the fossil species described by SCHLÜTER (1872-1876) and POCTA (1890). The standard sections in the quarries of Heidelbergcement are described by means of litho- and biostratigraphy. They belong to the Erwitte Formation of the Upper Plänerkalkstein Unit, and are Lower Coniacian. The prominent Mauerbank respectively Erwitte-Bank with an underlying ichnofossil layer and inoceramids as index fossils make a bank by bank correlation possible of the Heidelbergcement quarries and the bishop Meinwerk quarry. Its medieval quarrying was affected by some geological factors. The limestone was hard enough, and had resistance against weathering to be used as natural building stone. The rock texture enabled an easy extraction with hand tools and equipment of middle medieval. It was possible to break off bigger ashlars. The hydrogeological situation like a karst prevented a flooding of the quarry. Limestone of the upper Erwitte formation is the prevailing historical natural building stone of Paderborn, and had a building tradition from the 9 th century up to the beginning 20th century. Since the late 19th century natural building stones of the Salder Formation are increased used, and still they are needed for restoration of masonry. Traditional Paderborn paving is the Tudorfer Pflasterstein (Tudorf cobblestones), which is made of distinctive limestone horizons of the Erwitte Formation. Different natural building stones are explicitly rarer. One of theme is the Osning Sandstein (Osning Sandstone). It is used especially for ashlars, architrave blocks, baizes, columns, and building sculptures. Up to the beginning 19 th century the type Velmerstot was used, from the middle of the 19th it was type Grotenburg. The inconspicuous and according to experience rarely noticed "Sinterkalkstein von Salzkotten" (travertine of Salzkotten) can be consistently detected in Romanesque masonry. "Soester Grünsandstein" (Soest Greensand Stone) is very rare in Romanesque and early Gothic assemblies, and is entirely missing otherwise. "Rüthener Grünsandstein" (Rüthen Greensand Stone) was occasionally used during the 17th and 18th century for epitaphs and shrines, and later in the 19th and beginning 20 th century for architrave blocks, baizes and ashlars. Up to the end of the 19th century gravestones were made of Osning Sandstein, Rüthener Grünsandstein and Buntsandstein, before they were replaced by deep black gravestones (Schwarz Schwedisch, Black Diabas) imported from Sweden.

Turanian and Lower Coniacian exposures of the south-eastern Münster Basin between Augustdorf and Altenbeken are described by means of existing litho-, bio-and event stratifications. The traditional lithostratigraphical terms are faced to new defined NW-German ones. The Hesseltal Formation with the Cenomanian/Turonian boundary can be described by three small outcrops only. The Lower Turanian Büren Formation is exposed by two small marl pits. The Oerlinghausen Formation is shown by several forest tracks in the region of Berlebeck, Kohlstädt and Altenbeken, the Salder Formation by several disused quarries near Augustdorf and Kohlstädt. The Erwitte Formation as topmost lithostratigraphical unit could only be observed in the region of Schlangen-Kohlstädt. Important events and marker horizons of the Middle-, Upper Turanian and Lower Coniacian could be reconstructed. The volcanic ash layer Tuff TC has been proven in the working area in a forest track for the first time. So it is possible to integrate these sequences in the existing stratigraphical framework. Not rare occurrences of ammonite faunas in Middle and Upper Turanian sections are surprising where they could not be proved in other parts of the Münster Basin.

16 Cenomanian exposures of the south-eastern Münster Basin between Berlebeck and Veldrom, southern Teutoburger Wald and northern Eggegebirge, are described by means of existing litho-, bio-and event stratifications. The traditional lithostratigraphical terms are faced to new defined NW-German ones. The existing Cenomanian outcrops are integrated in a synoptical section. The lower part of the Herbram Formation is the Bemerode Member. It is known only by means of a drill. It is regarded as not to be subdivided Albian/Cenomanian transition. Exposures of the upper section of the Herbram Formation, belonging to the Mantelliceras mantelli Zone, exist at both sides of the federal road B 1 at Schlüsselgrund southwestern of Horn. In this area the single and as well small outcrop of the Baddeckenstedt Formation is found. It belongs to the lower Cenomanian Mantelliceras dixoni Zone. The lower part of the Brochterbeck Formation, the Ascheloh Member, is placed as well into this Zone. Several exposures are near Veldrom and Schlüsselgrund. There is as well exposed the upper part of the Ascheloh-Member with the marly primus event. It belongs to the lower Middel Cenomanian Acanthoceras rhotomagense Zone. There are several exposures of the upper part of the Brochterbeck Formation, the Hoppenstedt Member. To the best ones belong the western quarry of the Schlusselgrund realm and the quarry at the north-eastern slope of the Schierenbergs north-western of Kohlstadt. Both quarries expose the Middle/Upper Cenomanian transition with the upper Acanthoceras rhotomagense, the Acanthoceras jukesbrownei, and the lower Calycoceras guerangeri Zone. The Hesseltal Formation as uppermost lithostratigraphical unit of the local Cenomanium with the Metoicoceras geslinianum Zone was exposed only briefly during construction works at the federal road B1 northeast of Kohlstädt.

The Turanian and Lower Coniacian successions of the DIMAC quarry are documented by means of existing litho-, bio-, and eventstratigraphical divisions. The faunal contents are specified. Traditional names for lithological units are faced to current ones. The Hesseltal Formation has its type locality here and is very well exposed. This applies as well to the Büren and lower Oerlinghausen Formation. In contrast its upper section and the lower one of the Salder Formation are affected by faults. The Salder Formation has reversed faults of 5 m height. The Erwitte-Formation is exposed with its both members "Grauweiße Wechselfolge", and "obere Plänerkalkstein- Einheit". The lower part of the "Grauweiße Wechselfolge" is presented by the lower submarine slide. Its upper part is developed typically, and shows affinities to the Lengerich Formation by means of the intercalation of small marly limestone beds into marly horizons, and small limestone beds into apart from that massive limestone beds. The biostratigraphical subdivision of the DIMAC quarry has considerably been refined by isotope stratigraphical research. In consequence the Cenomanian/Turanian boundary placed in the Hesseltal Formation can by identified exactly. The problems of the Middle/Upper Turanian boundary are narrowed down. Due to the present excavation situation the Turanian/Coniacian boundary cannot by identified exactly. The Augustdorf Member of the Emscher Formation as exposed in the DIMAC quarry is of Lower Coniacian age according to existing collections.

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