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My research is currently centered on phylogeny, diversity patterns, palaeobiogeography, and palaeoecology of Devonian ammonoids. Apart from that, i work on several exciting topics including Palaeozoic reefs, conodonts, and Jurassic ichthyosaurs. Generally, i am easily enthused on all kinds of fossil groups and scientific methods used to better understand our planetary history.
The Hagen-Balve Reef Complex of the northern Rhenish Massif, Germany, is one of the best examples for the globally widespread Givetian to Frasnian reefs. At its eastern end, in the Hönne Valley, it reaches up to 1000 metres in thickness. In general, there is limited knowledge concerning the faunas and palaeoecology of Rhenish initial reef phases. A...
The Middle Devonian was a phase of extensive reef systems on a global scale. In this context, one of the best-known examples is the Givetian-Frasnian Hönne Valley Reef Complex in the northern Rhenish Massif, Germany. While there are several studies on the reefal faunal composition and stratigraphy, there is a great lack of knowledge concerning micr...
Ichthyosaurs are some of the most iconic extinct marine vertebrates, representing an important faunal element in marine ecosystems from the Early Triassic to the beginning of the Late Cretaceous. Early Jurassic ichthyosaurs are generally well known thanks to a series of Lagerstätten deposits in Europe, notably the early Toarcian Posidonienschiefer....
The famous Büdesheim Formation in the Eifel region (Germany, North Rhine- Westphalia) is known to be an extraordinary place to study upper Frasnian ammonoids. While previous studies focused mainly on the Gephuroceratidae, we take a closer look on the equally significant Tornoceratidae. A total of over 1400 well preserved tornoceratid ammonoids from...
The upper Frasnian of the Boudouda Formation of the Benahmed region yielded a diverse, originally pyritized (secondarily limonitized) ammonoid fauna that resembles assemblages from contemporaneous goniatite shales of the Rhenish Massif (Germany: Büdesheim Formation). There are nine species each of the Tornoceratidae and Gephuroceratoidea (Gephuroce...
Excavations in the Sand district of Bergisch Gladbach (Rhenish Massif, Germany) yielded a rich ammonoid fauna of the upper Frasnian “Archoceras” varicosum Zone (Upper Devonian I-K, interval between the two Kellwasser levels). The previously unknown assemblages include six tornoceratid genera with 20 species, including seven new species (Aulatornoce...
During a fieldtrip of the 10th International Cephalopod Symposium to the Tafilalt (SE Morocco), a fauna with the so far oldest ammonoid of the region was discovered at the top of the basal Emsian Deiroceras Limestone of Jebel Mech Irdane. The new material confirms the record of a single, poorly preserved specimen of the same age from Ras El Kebbar...
As a contribution to the ongoing international revision of the Devonian/Carboniferous boundary, we present a bed-by-bed study of the Reigern Quarry in the northern Sauerland (Rhenish Massif, Germany), which is famous as an uppermost Famennian ammonoid locality. Currently exposed are ca. 2.5 m of strongly cyclic Wocklum Limestone, conformably overla...
We present a new online database for quick and easy access to already published HRSC-based geological mappings on Mars.
This project aims for a better understanding on how the Kellwasser Crisis around the Frasnian-Famennian boundary influenced pelagic organism groups (e.g., ammonoids and conodonts). Research on the extinction as well as the recovery in that time interval is equally welcomed.