Karksilepisparva gen. et sp. nov. (Chondrichthyes) from the Burtnieki Regional Stage, Middle Devonian of Estonia

Abstract

Dermal scales of a new chondrichthyan were discovered in four levels in sandstones of the Härma Beds (lower part of the Burtnieki Regional Stage, Middle Devonian) in the Karksi outcrop of South Estonia. The classification of Karksilepis parva gen. et sp. nov. Märss is still uncertain.

The diplacanthid fishes (Acanthodii, Diplacanthiformes, Diplacanthidae) from the Middle Devonian of Scotlan

“…As in Scotland (Figure 2.2), D. crassisimus has quite a long range in the eastern Baltic, also found in the Eifelian Narva Formation (Valiukevičius 1985(Valiukevičius , 2003. Märss et al (2008) also report D. carinatus from the Karksi outcrop in the Härma Member, the lowest unit of the Givetian Burtnieki Formation, showing that both spines and scales of D. crassisimus occur in the Givetian of the eastern Baltic.…”

The Early Devonian Armoured Agnathans of Podolia, Ukraine

“…Also, scales of the chondrichthyan elasmo− branch? Seretolepis elegans Obruchev and Karatajãt− Talimaa 1968), Knerialepis mashkovae (Karatajãt− Talimaa, 1997), Altholepis composite Karatajãt−Tali− maa, 1997 and Ivanelepis costulata Karatajãt− Talimaa, 1997(Karatajãt−Talimaa 1997Hanke and Kara− tajãt−Talimaa 2002;Märss et al 2008) were found in limestone beds of the Chortkiv Stage. The number of recognised acanthodian forms reached 17, including all species from the preceding Stage (Valiukevičius 2000) as well.…”

Roundness and surface features of quartz grains in Middle Devonian deposits of the East Baltic and their palaeogeographical implications

“…In earlier works Pärnu and Gauja deposits are considered as tide-influenced delta sediments (Ponten & Plink-Björklund 2007;Tovmasyan et al 2008). However, the grain morphology and lithological character of sections (Märss et al 2008) show that delta deposition alternated with beach conditions and breaks in sedimentation. In the studied sections levels with smoothed and rounded grains alternate with levels dominated by subangular particles.…”