Commune: Busko-Zdrój (pow. buski, woj. świętokrzyskie)

Framework element or context represented:
Sequences of marine sediments of Upper Jurassic, Upper Cetaceous and Neogene (Badenian) of Nida basin separated with stratigraphic gaps and discordances.

Primary geological/geomorphological interest:
Stratigraphic sequence with Alpine tectonic gaps and unconformities.

Comparative assessment justification:
The most illustrative outcrop documenting stratigraphic-tectonic evolution of the Nida basin during Alpine cycle (Jurassic-Neogene).

Protection status and accessibility:
Protected as a documentary site (since 1993) – accessible.

Character of site: Abandoned quarry.

Area: 11.19 ha

Altitude: 270-285 m a.s.l.

Lithology: sandstones, conglomerates, breccias, other siliceous rocks, limestones, marls, shales

Discipline: Palaeoenvironment, Stratigraphy of Phanerozoic, Tectonics

Process Age: Quaternary, *all periods

Bedrock Age: Neogene, Cretaceous, Jurassic, *all periods

Description of primary interest:
The sequence exposed in the abandoned quarry comprises the Upper Jurassic limestones and Upper Cretaceous rocks overlain by transgressive facies of Miocene. Two phases of Alpine tectonic movements are perceptible here. The first discontinuity (gap with traces of erosion and low angle discordance) is observed between the Oxfordian limestones and Cenomanian sandstones. The Jurassic is represented with bedded limestones dipping 35º to the north. Thin Cenomanian glauconitic sandstone layer (less than 1 m) contains phosphorite nodules and inoceramian shells. It is overlain by the Turonian limestones grading to thick complex of Turonian and Senonian marls and opokas bearing numerous flynt nodules and horizons. Occurrence of relics of submarine hot water springs are supposed in the Cretaceous rocks. Paleo-surface of the Cretaceous and Jurassic rocks, shaped by marine abrasion, is discordantly covered by Badenian breccia-conglomerate, which is irregularly intercalated with sandy limestone. The breccia is composed of weakly cemented fragments of its substratum (limestones, flints and marls) - boulders, rubble, pebbles, often with animal borings (sponges, lamellibranchs, polychaetes, gastropods) and incrustations (bryozoans, polychaetes, lithothamnia). Biogenic material (foraminifera, algae) occurs also in matrix of the breccia. The main body of breccia represents allochtonous sediment of littoral fore-cliff depression. They are overlain by biodetrital and lithothamnian (algal) limestones containing also other fossils: foraminifers, gastropods, lamellibranchs (pelecypods), echinoids, and teeth of fishes. Miocene rocks slightly dip to the north (the discordance angle – ca. 20º).


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