Abstract
Rhaetic to Lower Liassic microfloras of gymnospermpollen, microspores and aquatic palynomorphs from outcrops and cored wells in southern Scandinavia and NW Germany are investigated. 146 groups of palynomorphs, mainly species are presented from the Danish borehole Rødby 1. Based mostly on restudy of the holotypes 24 new combinations for species/varieties occurring in Rødby 1 are proposed. One new species , Corollina zwolinskai ranging from Lower to Middle Rhaetic is described.The range of polynomorphs, mainly species are noted in the wells: Rødby 1, Maasbiüll 1 and Eitzendorf 8 and in a composite section from Scania. The following miospore zones are defined: The Corollina Enzonalasporites Zone (? Norian - Lower Rhaetic), the Ricciisporites Conbaculatisporites Zone (transition (Lower-) Middle Rhaetic), the Rhaetipollis Limbosporites Zone (Middle Rhaetic), the Riciisporites Polypodiisporites Zone (Upper Rhaetic), the Pinuspollenites Trachysporites Zone (Lias alfa 1-2) and an unnamed zone with Cerebropollenites macroverrucosus (Lias alfa 3 to beta to ?, upper boundary not defined). Within the Corollina Enzonalasporites Zone the following subzones are defined: The Corollina Porcellispora Subzone, the Granuloperculatipolis Subzone and above the Enzonalasporites Conbaculatisporites Subzone. The two latter subzones are probably restricted to the Lower Rhaetic. The zones and subzones are used to correlate the mainly non marine deposits of Rødby 1, Scania, Poland and E. Germany with the more marine deposits of NW Germanu.In Scania the stratum typicum of the stratigraphically important species Limbosporites Lundbladi Nilsson is shown to be (Middle) Rhaetic. Unmixed Lepidopteris and Thaumatopteris macrofloras are of (Middle) Rhaetic and Lias alfa age, respectively.In E Germany the topmost "Middle Keuper" sensu Schulz is transferred to the Lower Rhaetic.In Poland the Drawno Beds are shown to be Lower Rhaetic and the Weilichowo Beds to be Middle (to Upper) Rhaetic.Rødby 1 is correlated lithostratigraphically with wells in NW Germany mainly on basis of the clay colours (red and green in the Lower Rhaetic, dark grey in the Middle Rhaetic, brown to light greenish grey in the Upper Rhaetic and dark grey in the basal Liassic). The lithostratigraphy agrees closely with the palynostratigraphy in Rødby 1.
Highlights
More or less dark coloured plantbearing deposits are present over wide areas in Europe and North America at the Triassic-Jurassic boundary
II. rk. nr. 109 this depends on where the Norian/Lower Rhaetic boundary is placed in the Alpine Area, a question which lays beyond the scope of this paper
Schulz & Mai (1966) mention that C. macroverrucosus is absent in Lias alfa I and present in alfa 3 and doubtful in alfa 2 due to lack of samples dated by means of marine fossils
Summary
More or less dark coloured plantbearing deposits are present over wide areas in Europe and North America at the Triassic-Jurassic boundary. The present investigation deals primarily with the pollen and microspores in the plantbearing deposits and the overlying Lower Liassic shales in the Danish borehole R!,JJdby I Based on the distribution of Norian/Lower Rhaetic to Lower Liassic microfloras observed in NW Germany , South Denmark and Scania and partly known from literature on East Germany and Poland, a number of palynomorph zones are proposed. These zones are established to provide a biostratigraphical tool within the area mentioned II. rk. nr. 109 this depends on where the Norian/Lower Rhaetic boundary is placed in the Alpine Area , a question which lays beyond the scope of this paper
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
