The sedimentary succession in central Poland records significant changes in facies at the turn of the Plan- ula and Platynota zones in the Upper Jurassic, expressed by the drowning of the ramp-type platform and development of an extensive isochronous marl horizon. The topmost level of the marl ...
From the Kimmeridgian succession, four marl samples have been washed by standard method but we failed to find any protoglobigerinids in these facies. In calcareous indu- rated rocks, 41 thin sections of rocks collected by O. Langoisseux (coll. Cru) and eight by us (coll. W) have been...
All ostracods were recovered from clay- and marlstone samples, which were systematically sampled, and subjected to a standard screen-washing procedure. Microfossils were picked by the Palaeontology A16, and mainly found in fractions larger than 0.14 and 0.25 mm. All SEM photo- graphs were taken...
Hence, in an effort to better understand the processes controlling the formation of deeper-water carbonate ramps, fully quantitative palynofacies analyses were carried out on two cores from the Upper Jurassic (Kimmeridgian) of the Swabian Marl Basin, SW Germany. To eliminate the effect of ...
The topmost level of the marl horizon is a regional hardground, which is interpreted as the third-order sequence boundary Kim 1. In some areas, the hardground was eroded and is only preserved as bored and encrusted clasts. The composition of the borings may indicate th...
The topmost level of the marl horizon is a regional hardground, which is interpreted as the third-order sequence boundary Kim 1. In some areas, the hardground was eroded and is only preserved as bored and encrusted clasts. The composition of the borings may indicate that colonization and ...
The Kimmeridgian marl-limestone alternations of the North Aquitaine Platform include abundant tempestites that formed in shallow to moderate-depth marine environments affected by westward-moving cyclones. High-resolution sedimentological and sequence stratigraphic interpretations, combined with biostratigraphy ...
Spectral analysis reveals the complete suite of orbital frequencies (precession, obliquity, and eccentricity) with the marl-limestone couplets being primarily precession-driven. Frequencies detected by the spectral analysis are similar between the sections, but their relative amplitudes are somewhat different...
Shallow-marine Kimmeridgian (Late Jurassic) deposits in the Lower Saxony Basin (LSB) composed of alternating limestone, marl and claystone attract great palaeontological interest due to their rich invertebrate and vertebrate assemblages. Unfortunately, the absence of open-marine ma...
The origin of the rhythmic marl-limestone bedding recognized in Lower Kimmeridgian (Platynota Zone) succesions of the central Prebetic (Southern Spain) is interpreted. A detailed analysis was carried out on the basis of field observations and mathematical procedures of two sections characterized by ...