First biostratigraphic (palynological) dating of Middle and Late Cambrian strata in the subsurface of northwestern Algeria, North Africa: Implications for regional stratigraphy

2008 ◽  
Vol 149 (1-2) ◽  
pp. 57-62 ◽  
Author(s):  
Marco Vecoli ◽  
Blaise Videt ◽  
Florentin Paris
Keyword(s):  
North Africa ◽  
Late Cambrian ◽  
Middle And Late Cambrian

scholarly journals Cambrian Bradoriida and Phosphatocopida (Arthropoda) of the former Soviet Union

1997 ◽  
Vol 16 (2) ◽  
pp. 179-191 ◽  
Author(s):  
Ludmila M. Melnikova ◽  
David J. Siveter ◽  
Mark Williams
Keyword(s):  
Soviet Union ◽  
Former Soviet Union ◽  
Minor Component ◽  
Leningrad Region ◽  
The Urals ◽  
Late Cambrian ◽  
Central Asian ◽  
Early Palaeozoic ◽  
A Minor ◽  
Middle And Late Cambrian

Abstract. Some 40 bradoriid and phosphatocopid (Arthropoda) species are known from the Cambrian of the former Soviet Union. The faunas occur chiefly in Asia (mostly Siberia and Kazakhstan; also Kirghizia); west of the Urals bradoriid and phosphatocopid faunas are sparse, occurring in the Leningrad region, Belarus and Estonia. Most specimens are recovered as crack-out material from clastic and impure carbonate rocks; acid resistant valves from limestones are a minor component of the known faunas.Early Cambrian (Atdabanian-Botomian) faunas are widespread; middle and late Cambrian faunas are scarcer and are known largely from Siberia and Kazakhstan. Though many species are seemingly short-ranging, currently most have only local biostratigraphic significance, with only a few having practical international correlative value.Palaeogeographically, faunas west of the Urals show affinites with those of the Early Palaeozoic Baltica and Avalonia palaeocontinents (Olenellid trilobite realm). Siberian and central Asian (Kazakhstan, Kirghizia, Gorny–Altay–Mongolian belt) faunas show clear affinities with those of palaeocontinental South China and eastern Gondwana (Redlichiid trilobite realm).

scholarly journals New Cambrian faunas from Peary Land, eastern North Greenland

1979 ◽  
Vol 91 ◽  
pp. 29-36
Author(s):  
A.R Palmer ◽  
J.S Peel
Keyword(s):  
Lower Cambrian ◽  
Early Cambrian ◽  
Middle Cambrian ◽  
Late Cambrian ◽  
Middle And Late Cambrian ◽  
North Greenland

Early, Middle and Late Cambrian faunas from Peary Land, eastern North Greenland, are briefly documented. The Early Cambrian faunas of the lower Brønlund Fjord Group are assigned to the Bonnia-Olenellus Zone, although olenellids from the underiying Buen Formation may be older. Strata from the upper Brønlund Fjord Group with Middle Cambrian faunas are seemingly separated from the Lower Cambrian by a discontinuity, without representation of early Middle Cambrian zones. Faunas from lower beds of the overlying Tavsens Iskappe Group span the Middle-Late Cambrian boundary. Upper beds ofthe Tavsens Iskappe Group are assigned to the Late Cambrian, but corroborative faunal evidence is not yet available.

Fossil embryos from the Middle and Late Cambrian period of Hunan, south China

Nature ◽  
2004 ◽  
Vol 427 (6971) ◽  
pp. 237-240 ◽  
Author(s):  
Xi-ping Dong ◽  
Philip C. J. Donoghue ◽  
Hong Cheng ◽  
Jian-bo Liu
Keyword(s):  
South China ◽  
Late Cambrian ◽  
Middle And Late Cambrian ◽  
Fossil Embryos

Latest Middle Cambrian metazoan reef from northern Iran

1995 ◽  
Vol 132 (4) ◽  
pp. 367-373 ◽  
Author(s):  
B. Hamdi ◽  
A. Yu. Rozanov ◽  
A. Yu. Zhuravle
Keyword(s):  
Northern Iran ◽  
Middle Cambrian ◽  
Middle Ordovician ◽  
Late Cambrian ◽  
The Family ◽  
Middle And Late Cambrian

AbstractMiddle and Late Cambrian reefs were built mainly by cyanobacterial communities. A few reefs with a metazoan as well as an algal component, however, are known from this interval. A Middle Cambrian reef formed primarily by spicular demosponges is described here from the Mila Formation in the Elburz Mountains, northern Iran. The reef is enclosed within calcareous grainstones which contain terminal Middle Cambrian (late Mayan) trilobites. The Mila Formation reef was constructed by sponges of the family Anthaspidellidae and bacterial (algal?) sheaths, and is the earliest metazoan reef to be documented from the interval after the demise of archaeocyath sponges. The reefal community is typical of subsequent reefal communities of Early–Middle Ordovician age. The Ordovician examples differ only by the incorporation of additional metazoan elements.

Multiple Archaean to Early Palaeozoic events of the northern Gondwana margin witnessed by detrital zircons from the Radzimowice Slates, Kaczawa Complex (Central European Variscides)

2007 ◽  
Vol 145 (1) ◽  
pp. 85-93 ◽  
Author(s):  
RAFAŁ TYSZKA ◽  
RYSZARD KRYZA ◽  
JAN A. ZALASIEWICZ ◽  
ALEXANDER N. LARIONOV
Keyword(s):  
North Africa ◽  
Detrital Zircons ◽  
Central European ◽  
Late Cambrian ◽  
Gondwana Margin ◽  
Sw Poland ◽  
Depositional Age ◽  
Ordovician Magmatism ◽  
Early Palaeozoic ◽  
European Variscides

AbstractSIMS dating of detrital zircons from the stratigraphically enigmatic Radzimowice Slates of the Kaczawa Mountains (Sudetes, SW Poland), near the eastern termination of the European Variscides, has yielded age populations of: (1) 493–512 Ma, corresponding to late Cambrian to early Ordovician magmatism and constraining a maximum depositional age; (2) between 550 and 650 Ma, reflecting input from diverse Cadomian sources; and (3) older inherited components ranging to c. 3.3 Ga, with age spectra similar to those from Gondwanan North Africa. The new data show that the Radzimowice Slates cannot form a Proterozoic base to the Kaczawa Mountains succession, as suggested by earlier models, but was deposited, at the earliest, as an extensional basin-fill, during a relatively late stage of the break-up of this part of northern Gondwana.

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