[3] Luehndea spinosa, with a single recovered specimen spans between the Late Pliensbachian (Margaritaus) to the Lowermost Toarcian (Tenuicostatum).

Increased carbon-bearing capacity, locally present in the profile of the Upper Forest land sediments, was the basis for the development coal mining in this area in the years 1818–1959.

The mining center at that time was concentrated in the vicinity of Poręba near Zawiercie, as well as in a dozen other towns (Sprawowice, Blanowice, Łazy, Siewierz).

[8] The best lithological profile of the productive section of the Blanowice Formation was developed on the basis of the exposure in the trench made in Kierszula near Poręba.

Mostly the local successions start with the Blanowice Formation, which rests with a large stratigraphic hiatus on Upper Triassic strata.

[12] At the bottom, with a depth of 4.75 m a major layer of clay is present, which in the lower section is characterized by an abundance of plant detritus.

Finally, on the Kierszula pit, under the bottom surface of the coal seam and the accompanying shoal, fragments of root plants arranged most often in the position of their growth were found.

[1][13] Both sequences are locally very difficult to distinguish, as in places like the Wrêczyca 3/81 borehole the 2 along the VII are part of a series of amalgamated alluvial—meandering river deposits.

[2] This marine boreholes had a similar nearshore facies across the boundaries of the sequences, and several fossils recovered point to a nearby connection with the Tethys Ocean at the south of the formation.

The local Coal Bearing facies corresponds to the major flooding surface found on the depositional sequence VII.

[1][13] On the Toarcian, a major local transgression correlated with the Early Toarcian sea-level rise clearly recognized in Western Europe, the Silesian-Cracow area was encroached by the sea from the Polish Trough from the north and northeast, which resulted in the termination of alluvial sedimentation of the underlying uppermost part of the Blanowice Formation.

[17][6] In the Early Jurassic the Blanowice Beds were surrounded by land to the north, east and south making that terrestrial area the source of its sediments, that were deposited on a nearshore paralic coal.

[18] The organic matter found associated with the local Coal includes the oldest known Biomolecules (On the Mrzygłód clay-pit), that are composed by Labdanoic Acid, Ferruginol, Sugiol and 7-Oxototarol.

[18] Hopane isomers (that can be used for estimation of the organic matter maturity) are in relatively high amounts in all samples taken, suggesting immature character.

[18] This is also confirmed by the occurrence of unstable biomolecules in the coal samples, including Labdanoic Acid, Ferruginol, Sugiol, Oxototarol, Sitosterol and Cholesterol.

The Cupressaceae and/or Podocarpaceae families are considered the main peat-forming plant species (Due to the presence of phenolic Abietanes and dehydroabietic acids).

[16] The Structure of the main depositional setting has been seen divided in 3 parts: on the center, near Kaszewy Kościelne there was a major restricted brackish-marine basin, with seasonal influxes of marine water.

[16] On the Mrzygłód mine samples there is a domain of land-derived Phytoclasts and Palynomorphs, with abundance of the cyst Nannoceratopsis, that is considered a euryhaline genus.

[3] High amount of terrestrial organic matter shows that there was an intense supply and accumulation of land-derived organic particles from surrounding land areas, what, along with the decrease of salinity conditions, thanks to the dinocysts conclude that the assemblage represents a part of the Blanowice Formation deposited in a proximal area under brackish conditions, with possible changes on the range of salinity.

[11] The Pollen of coniferous plants has been seen as connected with the Cheirolepidiaceae group, on an assemblage of herbaceous peat-bog vegetation, characterized by predominance of ferns, was most probably the parent material for that variety of coals.

The presence of fairly thick laminae of Vitrain in the Kierszuła middle layers indicates some phases with share of forest assemblage marked in area of contemporary peat-bog.

The species Densoisporites rugosus can be a junior synonym of Densosporites solaris Punctatisporites[11] Spores Affinities with the genus Sphenophyllum and Rotularia marsileafolia inside Sphenophyllaceae.

Climbing ferns, that grew over trees and are Pyrofiles, fuel for peat fires, whose presence are widely recorded locally on the Blanowice Brown coals.

Cyathidites minor almost certainly belong to well known Mesozoic species Coniopteris hymenophylloides and to other fossil cyatheaceous or dicksoniaceous ferns such as Eboracia lobifolia and Dicksonia mariopteri.

Is among the most abundant flora recovered on the upper section of the coeval Rya Formation, and was found to be similar to the pollen of the extant Encephalartos laevifolius.

[28] The frequency of fungal spores on the Polish basin on the Pliensbachian-Toarcian transition is correlated with negative C isotope peaks and enhanced cuticular plant litter accumulation, pointing to climate-driven enhanced decomposition of wood and rapid destruction of terrestrial carbon, which may have played an important role in the aggravation of the Jurassic Greenhouse disaster.

[28] Measured increasing of temperature favoured local fungal-mediated decomposition of plant litter, specifically of normally resistant wood.

Related with the extant genus Dictyosporium, recorded worldwide from dead wood, decaying leaves, and palm material.

They can occur in large aggregates, where occasionally traces present on agglomerations show a clear orientation, probably parallel to the palaeocurrent direction, which is associated with locomotion of the burrowing animal.

The Alluvial deposits of the Blanowice formation recover the best local place for Leech cocoons, as proven by the major concentration of specimens found on the lower Jurassic Polish Basin.