Acritarchs from the Duolbagáisa and Kistedalen formations (Cambrian Series 2-3), Digermulen Peninsula, northern Norway

• New information on acritarchs from the upper part of the Duolbagáisa Fm., and the lower part of the Kistedalen Fm., on SE Digermulen Peninsula, northern Norway, adds biostratigraphical control to previous studies on trilobites and acritarchs. Levels with Kjerulfia lata, Kjerulfia sp. and Ellipsocephala sp., in the upper part of the Duolbagáisa Fm., yield abundant Skiagia ciliosa, indicative of the H. dissimilare-S. ciliosa Zone (Cambrian Series 2, Stage 4). Higher in the Duolbagáisa Fm., some ten metres above an unidentified ellipsocephalid, Liepaina plana occurs with single specimens of Comasphaeridum longispinosum and Sagatum priscum. L. plana and S. priscum indicate the Volkovia-Liepaina Zone, which spans the traditional lower-middle Cambrian boundary; C. longispinosum is known only from the middle Cambrian. The basal part of the K1 Mbr of the Kistedalen Fm., yields Retisphaeridium dichamerum, Multiplicisphaeridium parvum and Eliasum llaniscum; on the NW side of the peninsula trilobites from this interval include Ellipsocephalus cf. hoffii and Eccaparadoxides cf. pusillus. Higher in the K1 Mbr, a second acritarch assemblage includes Cristallinium cambriense, Adara undulata and Vulcanisphaera sp., and, close to the top of this member appears Adara alea. In the K2 Mbr there is a successive appearance of Timofeevia lancarae (sensu Palacios 2015), Symplassosphaeridium cambriense and Cristallinium dubium. The highest record of Eliasum llaniscum is close to the top of the member. Acritarchs from the lower part of the Kistedalen Fm. can be readily assigned to Cambrian Series 3 acritarch zones established in northern Gondwana and Avalonia, and allows for a more precise calibration of Welsch's (1986) AI and AII acritarch zones established on the Digermulen Peninsula.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

Earth Science with specialization in Historical Geology and Palaeontology

Geovetenskap med inriktning mot historisk geologi och paleontologi

Publikations- och innehållstyp

vet (ämneskategori)

kon (ämneskategori)