At the Late Pliensbachian (Margaritatus-Spinatum) several changes occur on the Polish Basin. The last section, latest Raricostatum subzone, there were a series marine transgressive surfaces, linked with the called Pli1 transgressive phase, known thanks to molluscs and ooids, along with an increase of marine macrofauna and microfauna. A marine Ingression filled the Polish basin, depositing marine dark Clay, Mudstone and lenticular Heteroliths, that are abundant on the lower-Middle Pliensbachian Łobez Formation and Poland, where dark-grey marine Claystones appear on the Kaszewy 1 borehole. There was a visible Shoreline retreat that ends on the beginning of the Late Pliensbachian Margaritatus Chronozone. After the Pli1, a series of local subordinate retrogradational stratal-pattern architectures indicate the transgressive phase of the sequence Pli2. Pli2 The transgressive phase led to a maximum flooding level at the middle Spinatum. That was known thanks to Ammonites found on an 85 m basin at NW Poland, on the Wolin IG-1 borehole. This transgression also impacted deposition, with 265 m sequences of Mudstones and Sandstones in a syndepositional tectonic graben at the Wolin-Recław Zone. After the maximum peak of the flooding basin it followed a regressive phase, characterized by progradational fluvio-deltaic Sandstones, like the series of Sandstones that recover the major tracksites of the Drzewica Formation, the Śmiłów Quarry Tracksite and the Wólka Karwicka Tracksite, both know from a regression nearshore/barrier lagoonar derived sandstone deposit. The Coeval deposits of Usedom and East Prignitz on Germany contain numerous Glendonites (Calcite pseudomorphs after Ikaite), what lends support to the possibility of a Late Pliensbachian cooling event and polar Glaciation at that time. Mostly of the authors, based on the current scientific quorum and the wide distribution of Glendonites in Upper Pliensbachian strata, tend to support a glacial-derived hypothesis.
