Lower Jurassic (Hettangian–Pliensbachian) microfossil biostratigraphy of the Ballinlea-1 well, Rathlin Basin, Northern Ireland, United Kingdom
نویسندگان
چکیده
The thickest section of Early Jurassic strata known from onshore Ireland (total thickness 566 m) is reported the Ballinlea-1 well (Rathlin Basin) situated on north coast Northern Ireland. A biostratigraphical and palaeoenvironmental assessment presented for this largely based calcareous benthic microfossils (foraminifera ostracods). Waterloo Mudstone Formation (Lias Group) has previously received little micropalaeontological attention, therefore work provides an opportunity to enhance palaeogeographic understanding province, paper illustrates key microfossil taxa age first time. records, ditch-cuttings samples, demonstrate a stratigraphical range Hettangian Pliensbachian, consistent with other wells boreholes in basin. assemblage compositions are comparable those elsewhere European boreal Atlantic realm. earliest Sinemurian assemblages generally low diversity numerically dominated by metacopid ostracods occasional influxes foraminifera. Gradually, foraminiferal abundance (often species Lagenida) come exceed reaching their greatest Late Sinemurian. sediments considered represent inner mid-shelf environment throughout while record region indicates ongoing syn-sedimentary fault movement along basin margins within period.
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ژورنال
عنوان ژورنال: Proceedings of the Geologists' Association
سال: 2021
ISSN: ['0016-7878', '2773-0743']
DOI: https://doi.org/10.1016/j.pgeola.2020.06.002