Ammonites and ammonite stratigraphy of the Bimammatum Zone and lowermost Pianula Zone (Submediterranean Upper Oxfordian) at Bobrowniki and Raciszyn in the Wieluń Upland, central Poland

摘要: Abstract. An extensive collection of ammonites made bed by from sections in the Submediterranean Upper Oxfordian Wielun Upland, Central Poland, is described and used as a basis for chronostratigraphical interpretation deposits. The are mostly character enable recognition Bimammatum Zone, including Hauffianum subzones, well lowermost Planula Zone distinguished here new biostratigraphical horizon – matyjai based on occurrence Subnebrodites Wierzbowski et Glowniak sp. nov. oppeliids with Taramelliceras ( ) [M] Glochiceras Lingulaticeras [m] most numerous, Richeiceras (Metahaploceras) Coryceras [m]. profusion these two groups stratigraphical interval studied provides information their evolution, oppeliid species, zelcense bobrownikiense nov., here. Subboreal Boreal not common sections, but nevertheless important correlation. Subborealammonites family Aulacostephanidae represented genus Vineta [M], its newly recognized microconchiate counterpart, [m], established Vielunia gen. type species dzalosinensis latter includes previously referred area study to Ringsteadia , counterpart assigned Prorasenia comprise late cardioceratids Amoeboceras Plasmatites ). These indicate that deposits question up correlate Kimmeridgian (Baylei Bauhini respectively).