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Proposal of the Muller Canyon section (New York Canyon area, Nevada, USA) as stratotype for the Triassic/Jurassic boundary

Guex J., Taylor D., Rakús M., Bartolini A., Atudorei V., Carter E., Lucas S.

Volumina Jurassica

2006

Vol. 4, no. 1

283-285

Completeness of the sedimentary and biostratigraphic record is the most important characteristic of a global stratotype intended to record the boundary between two geological stages. Such a reference section must also contain fossils with proven chronological value. In the Jurassic, ammonites are usually considered the ideal chronological marker and all high-resolution zonations concerning that period are based on this fossil group. Figure 1 demonstrates that the Muller Canyon section (New York Canyon area, Nevada, USA) provides by far the most complete biochronological ammonite sequence known in the world for this interval of time. The oldest Jurassic ammonites found in the area are the smooth Psiloceras tilmanni and P. spelae, which are characterized by nodes in their earliest stage of development (Knötchenstadium). Odoghertyceras, a genus found also in Peru and Canada, occurs just above that fauna. Other smooth ammonites found between the first occurrence of P. spelae and the last occurrence of Choristoceras crickmayi belong to a group that we call "intermediate phylloceratids". Such forms lack the nodose juvenile stage and are geometrically intermediate between rhacophyllitids and psiloceratids. In our region, C. crickmayi (younger than C. marshi) co-occurs with the last Arcestes, Placites and abundant Rhacophyllites. In our sections we have found the first Jurassic-type bivalves below the first occurrence of Psiloceras, in beds that we assign to the topmost Rhaetian. In our view, the occurrence of bivalves is strongly controlled by the nature of the sediments and by local ecological conditions and this group does not seem suitable for use as index for the base of the Jurassic. The absence of Triassic ammonoids in the classical NW European sections precludes the possibility of defining the stratotype for the Triassic/Jurassic boundary (TJB) in that region and the ammonite faunas are not well diversified in the classical Tethyan Alpine sections. At present, there are three potentially good GSSP candidates: Chilingote (Peru), Kunga Island (BC, Canada) and Muller Canyon (Nevada). As far as ammonite record is concerned, Nevada ranks foremost. However, an interesting solution would be to propose the Kunga Island section (British Columbia) as parastratotype because it records a complete sequence of radiolarians across this interval, and this group is not preserved around the TJB in the New York Canyon area.

Software for Creation of a Database of Ornamentation of National Woven Fabrics

Katunskis J., Milašius V., Taylor D.

Fibres & Textiles in Eastern Europe

2004

Vol. 12, no. 4 (48)

43--46

We present an original software package for the creation of a database which would enable the storage of ornamentations of national fabrics. A suitable design of the database is the keystone for selecting software which would allow the storage, re-design and visualisation of ornamentations effectively, accurately, and efficiently. The software we have developed contains three main modules which have the following functions: the creation and loading of a database, the presentation of a record set in the ‘ornament design window’, and printing the record set data with the aid of a specialised window. The second module is the main one, because provisions are made for the researcher (for example, an ethnologist or museum-specialist) to understand more deeply a given ornament’s structure and the methods of its creation. The ornament notation system we propose allows the presentation of an ornament as analysed in the ‘ornament design window’ in a view that corresponds completely to the original sample. In addition, this database allows the textile designer to choose a segment stored therein, to create a new ornament using the symmetry operations, and finally to compare it with the original sample. The database application program presented contains Lithuanian national ornaments, but it can be successfully used in a broader context for the analysis and comparison of the ornamentation of various cultures.

Przedstawiono oryginalne oprogramowanie dla tworzenia bazy danych, pozwalającej na gromadzenie informacji o ornamentach tkanin ludowych. Konfiguracja bazy danych jest podstawą do wybrania takiego oprogramowania, które pozwoli na efektywne i dokładne gromadzenie, przekształcanie i wizualizację wzornictwa. Oprogramowanie, opracowane przez autorów, spełnia następujące funkcje: tworzenie bazy danych i wprowadzanie informacji, prezentacja zapisu w oknie nazwanym „projekt ornamentu " oraz druk zapisu w kolejnym oknie. Drugi moduł oprogramowania jest najważniejszy, ponieważ umożliwia badaczowi (np. etnologowi lub pracownikowi muzeum) na bardziej wnikliwe zrozumienie struktury ornamentu i sposobów jego tworzenia. Proponowany przez autorów system notacji pozwala na prezentację analizowanego wzoru w oknie „projekt ornamentu" w sposób, który całkowicie odpowiada oryginalnej próbce tkaniny. Baza danych pozwala projektantowi dodatkowo wybrać skatalogowany segment i stosując odpowiednie operacje symetrii, stworzyć nowy ornament i porównać go z oryginalną próbką. Opracowane przez autorów oprogramowanie zostało zastosowane do stworzenie bazy ornamentów litewskich tkanin ludowych, ale może być też stosowane skutecznie dla analizy i porównywania ornamentów innych kultur.