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Piaskowce dolnego dewonu na górze Barczy (Góry Świętokrzyskie) i historia ich eksploatacji

Król Paweł, Fijałkowska-Mader Anna, Kozak Bartosz, Giełżecka-Mądry Dorota

Przegląd Geologiczny

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2021

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Vol. 69, nr 2

81--90

EN

The beginning of exploitation of the Lower Devonian sandstones on Barcza Hill, located in the Klonów Range in the central part of the Holy Cross Mountains, dates back to the first decade of the last century. Sandstones of the lower Emsian Barcza Beds, known in older literature as “placoderm sandstones” were mined here. By the time of World War II, there were seven mines that produced mainly paving stones and crushed stone. Three of them resumed work after the war: “Kopalnia Nowa”, “Byk” and “Przy Pomniku”. Unfavourable deposit conditions and competition of the neighbouring mining plants "Bukowa Góra” and "Wiśniówka” led to the abandonment of mining on Barcza Hill in the late 1950s. In 1984, the “Barcza” nature reserve was created, which included the two largest quarries: "Kopalnia Nowa”and "Byk”.

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Wiek dolnodewońskiego poziomu tufitowego z Barczy (Góry Świętokrzyskie) na podstawie miospor

Fijałkowska-Mader A., Malec J.

Przegląd Geologiczny

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2018

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Vol. 66, nr 9

578--584

EN

Results of palynological studies of the Lower Devonian siliciclastic deposits of the Barcza Beds (Upper Pragian-Lower Emsian) from two abandoned quarries at Barcza in the Holy Cross Mts. is presented. Based on miospores, the biostratigraphic position of the tuffite horizon from the Barcza profile was defined as the early Emsian AB (annulatus-bellatulus) palynological Zone.

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Vascular structure of the earliest shark teeth

Martínez-Pérez C., Martín-Lazaro A., Ferrón H. G., Kirstein M., Donoghue P. C. J., Botella H.

Acta Geologica Polonica

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2018

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Vol. 68, no. 3

457--465

EN

Here we use synchrotron tomography to characterise dental vasculature in the oldest known tooth-bearing sharks, Leonodus carlsi Mader, 1986 and Celtiberina maderi Wang, 1993. Three dimensional reconstruction of the vascular system and microstructure of both taxa revealed a complex and dense network of canals, including horizontal, ascending and secondary bifurcated canals, as well as histological features consistent with an osteodont histotype. However, L. carlsi and C. maderi also exhibit significant morphological differences, showing Leonodus a typical diplodont tooth morphology with a linguo-labially elongated base, that contrast with Celtiberina’s teeth that show a single conical cusp curved lingually with a week developed flat base mesio-distally extended, perhaps reflecting distant relationship. These data are compatible with a pre-Devonian diversification of the two main tooth types traditionally recognised in Palaeozoic sharks (i.e., “cladodont” vs “diplodont”). Finally, our data demonstrate that existing dental classification schemes based on styles of vascularisation are over-simplified, especially when Palaeozoic taxa are considered.