Welcome to the Portal of Graptolites and Pterobranchs Beklemishev (1970) concluded that the secretion of the graptolite periderm followed entirely the pterobranch mode. He ascribed the formation of the cortical coating to secretionary activity of the zooids, which left their zooidal tubes and crept over the outer surface of the thecae, thus covering them with secondary layers of a peridermal ...

British and Irish Graptolite Group (BIG-G), study of fossil graptolites ...

Graptolites Following are graptolites collected from the Athens Shale formation (Ordovician age) near Montevalo, Alabama. The Athens shale tends to be a nice formation for collecting graptolites, as the dark carbonized remains of the graptolite contrast sharply with the tan to cream colored shale. In fact, it seems that the presence of graptolites in the shale influenced the coloration, as there ...

Prof. Dr. Bernd-Dietrich Erdtmann Academic address: Prof. Dr. B.-D. Erdtmann Technische Universitat Berlin Institut fur Angewandte Geowissenschaften II FG Historische Geologie und Palaontologie Ernst-Reuter-Platz 1 D-10587 Berlin GERMANY Tel.: ++49 30 314-23582 Fax: ++49 30 314 79471 e-mail: berni.erdt@tu-berlin.de ACADEMIC CAREER M.Sc. : University of Oslo, Norway, Institut of Geology (1965) - ...

Denis Bates Homepage Dr Denis Bates (with Dr Nancy Kirk - Honorary College Fellow): Research Interests Morphology, Ultrastructure, Mode of Life and Evolution of Graptolites. Research into graptolites commenced with a publication by Dr Kirk in 1969, setting out a radically new interpretation of the mode of life and evolution of the planktonic Graptoloidea, followed by further papers by her on ...

Barrie Rickards General information Reader in Palaeobiology Curator, Sedgwick Museum Fellow, Emmanuel College, and Curator, Douglas Finlay Museum of College Life Telephone: +44 (0) 1223 333 437 (Department) +44 (0) 1223 334 282 (College, direct line) +44 (0) 1223 334 282 (College, messages) FAX: +44 (0) 1223 333 450 E-mail address: sjl11@esc.cam.ac.uk (Secretary) Research Interests Phylum ...

Graptolite growth Dendroid graptolites grow in a pattern which can be modelled using classical context-sensitive rewriting rules. Such a model is described in Swan 1990. Giving more attention to biochemical detail, one can also model the branching pattern using differential equations for the flow of growth regulators and nutrients. A simple such model gave the result in the figure above (left).

DISCOVERY OF PTEROBRANCHIA (GRAPTOLITHOIDEA) IN THE PERMIAN PIOTR MIERZEJEWSKI and CYPRIAN KULICKI Acta Palaeontologica Polonica 2002, 47, 1, 169-175 The fossil remains of a hemichordate exoskeleton, recognized as fragments of the stolons and their cyst-like swellings connected with the fusellar zooidal tubes, were derived by chemical isolation from Late Permian (Kazanian) mudstones of the ...

Nature of the Stolonoidea (Graptolithoidea) by Piotr Mierzejewski The order Stolonoidea has been proposed on the basis of material from the Tremadoc in the Wysoczki locality by Koz owski (1938) without diagnosis, next defined by Bulman (1938) and described adequately by Koz owski (1949). The stolonoid forms, fairly fragmentary and rare, are placed in a single genus Stolonodendrum Koz owski, ...

Graptolite Tetragraptus fruticosus Ordovician Bendigonian Series Bendigo, Victoria Australia Viewer Comments: The graptolites from Bendigo were the first I ever seriously collected on a field trip with the Geelong gem & mineral club along with the Bendigo club as hosts. Most of the sites for the nice brown graptos have been vandalized to the point where they no longer exist, but there are lots ...

Graptovermida by Piotr Mierzejewski Graptolite Net The Graptovermida are extremely rare and poorly known Ordovician and Silurian organic microfossils. These enigmatic forms were described by Koz owski (1949) as a provisional group of marine invertebrates in some way related to pterobranchs and graptolites. To date, graptovermids have been known from the early Ordovician of Poland (Koz owski ...

ABSOLUTE FINITE STRAINS FROM RECONSTRUCTIONS OF FRACTURED PYRITIZED GRAPTOLITES AND VOLUME CHANGE IN THE TACONIC SLATE BELT, EASTERN NEW YORK WITKOWSKI, Christine M., Dept. of Geology and Geophysics, Univ of Connecticut, Storrs, CT 06269-2045, cmwitkow@cs.com and CRESPI, Jean M., Dept. of Geology and Geophysics, Univ of Connecticut, Storrs, CT 06269-2045 The interpretation of volume change ...

Chaunograptus and the Dendroidea written by Piotr Mierzejewski Chaunograptidae were initially defined as: Free dendroid or irregularly branching encrusting rhabdosome with free conical thecae (Bulman 1955, p. V36). Bulman (1955) assigned to that family the following genera: Chaunograptus Hall, Mastigograptus Ruedemann and Haplograptus Ruedemann. Chaunograptidae were initially treated as ...

Dithecoid graptolites (Dithecoidea) - a taxonomic wastebasket written by Piotr Mierzejewski Obut (1964) ascribed a specific role in early phylogenetic development of graptolites to the graptolite order Dithecoidea, proposed by him (Obut 1960). The order was characterized as comprising graptolites with bushy to tree-like colonies budding in diads, and dimorphism of thecae (bithecae missing).

M.J. Melchin and M.E. DeMont (1995). Possible propulsion modes in Graptoloidea: a new model for graptoloid locomotion. Paleobiology. 21(1): 110-120. Summary The motion of locomotion of any swimming animal is constrained by its size, architecture, and phylogenetic history. Considering these factors and the range of locomotory systems used by extant zooplankton, the range of possible modes of ...

Home Page of Piotr Mierzejewski, the Count of Calmont A Free Graptolite Researcher and a Rosicrucian Frater See also http://www.graptolite.net/ I studied biology and geology at the University of Warsaw, and received my M.Sc. degree cum laude in zoology and palaeontology under Professor Adam Urbanek. My first papers were published in scientific journals during my studies. My first appointment ...

Inocaulis, Order Inocaulida and Graptolites written by Piotr Mierzejewski Ruedemann (1947) established graptolite family Inocaulidae allocating in the genera Inocaulis Hall, Thallograptus Ruedemann, Medusaegraptus Ruedemann and Diplospirograptus Ruedemann. Bou ek (1957) excluded the genus Thallograptus from that family, allocated the genus Palmatophycus Bou ek, and rised its rank to the order ...

Melanostrophus fokini pik, 1930 an enigmatic Ordovician hemichordate Graptolite Net The fossil genus Melanostrophus was proposed by pik (1930) in order to embrace two Ordovician species: Melanostrophus fokini pik, 1930 (type species) and M. signum pik, 1930, both from the Ordovician of Estonia. Various authors were of conflicting opinions about the taxonomic position of these forms. pik placed ...

Silurian fossil gallery no. 10 ...

Silurian fossil gallery no. 6 ...