Palynostratigraphy of the Triassic-Jurassic transition in southern Sweden
Författare
Summary, in English
Palynological samples from Upper Triassic and Lower Jurassic exposures and borehole sections of the Hoganas and Rya formations (Fm), NW Skane (Sweden), exhibit diverse and generally well-preserved palynomorph assemblages that can be divided into four miospore zones (from bottom to top): (1) the informal "Topmost upper Rhaetian" zone of Lund; (2) the TSI assemblage zone which spans the Triassic-Jurassic (T-J) boundary; (3) the Hettangian Pinuspollenites-Trachysporites Zone and (4) the Sinemurian Cerebropollenites macroverrucosus Zone. Uppermost Rhaetian and T-J boundary strata have previously been considered to be absent in Skane, but are identified palynologically in all but one (Kulla-Gunnarstorp) section in this study. The palynological assemblages characterise continental deposition with intermittent marine influences. The presence of well-preserved miospores in nearly all assemblages indicates minimal transport during dispersal and deposition. The T-J transition is characterised by a spore-spike, not previously recognised in T-J assemblages of Skane. However, the upper Hettangian and Sinemurian assemblages of this study are similar in composition to coeval palynofloras derived from sediments deposited in paralic environments elsewhere in Skane and Denmark.
Avdelning/ar
Publiceringsår
2009
Språk
Engelska
Sidor
147-163
Publikation/Tidskrift/Serie
GFF
Volym
131
Issue
1-2
Dokumenttyp
Artikel i tidskrift
Förlag
Taylor & Francis
Ämne
- Geology
Nyckelord
- Sweden
- Skane
- zone
- Cerebropollenites macroverrucosus
- Pinuspollenites-Trachysporites zone
- spore-spike
- palynology
- Triassic-Jurassic boundary
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 2000-0863