Correlation of the Middle and Upper Permian marine and terrestrial sedimentary sequences in Polish, German, and USA Western Interior Basins with reference to global time markers

Palaeoworld ◽  
2009 ◽  
Vol 18 (2-3) ◽  
pp. 193-211 ◽  
Author(s):  
Mirosław Słowakiewicz ◽  
Hubert Kiersnowski ◽  
Ryszard Wagner

An endeavour is made to trace the evolution of mammals from Cotylosaurian ancestors through the carnivorous Therapsida. In Upper Carboniferous times the line probably passed through some primitive generalised Pelycosaurs; in Lower Permian through primitive, probably Therocephalian, Therapsids. In Middle and Upper Permian the line passed through the Gorgonopsia. In Triassic times the mammalian ancestors were small generalised Cynodonts. In Lower Jurassic the mammals are so Cynodont-like, and the Cynodonts so mammal-like, that in no single case are we absolutely certain which is which. In the Therocephalia, the Gorgonopsia, and the Cynodontia, the skull is very mammal-like. The zygomatic arch is, as in mammals, formed by the jugal and the squamosal. The teeth are divided into incisors, canines and molars. In the later Gorgonopsians there is an imperfect secondary palate; in Cynodonts a complete secondary palate as in mammals. In Permian Therapsids there is a single occipital condyle; in the Triassic Cynodonts there may he a single condyle slightly divided or two exoccipital condyles. There is, on passing from earlier to later types, a steady increase in the size of the dentary and decrease in the size of the other elements of the jaw. The quadrate also becomes much reduced in the higher types. In Gorgonopsians and probably all earlier types the arch of the atlas is a pair of bones; in Cynodonts, as in mammals, there is a single arch.


1989 ◽  
Vol 63 (6) ◽  
pp. 778-800 ◽  
Author(s):  
J. Keith Rigby ◽  
Fan Jiasong ◽  
Zhang Wei

Inozoans are described from patch reefs on the carbonate platform of eastern Sichuan, from the uppermost Permian Laolongdong reefs in the Changxing Formation (Kazanian–Tatarian) at Beipei, northwest of Chongqing, and from Middle and Upper Permian reefs from the Maokou (Kungurian), Wujiaping (Ufimian), and Changxing Formations at Xiangbo, Longlin County, in northwestern Guangxi. Classification of inozoans, particularly late Paleozoic ones, is still in a state of flux, but genera recognized to date can be keyed using the general nature of the spongocoel, canals, and growth form.New genera described are Intratubospongia, Grossotubenella, Cavusonella, and Radicanalospongia. The new species described are Stellispongia radiata, S. minor, Peronidella beipeiensis, P. regulara, P. parva, Intratubospongia typica, I. tenuiperforata, I. multisi-phonata, I. minima, Grossotubenella parallela, Cavusonella caverna, and Radicanalospongia normala. A Corynella that is not identifiable to species and a sphinctozoan-like inozoan(?) sp. A that has a fibrous-appearing internal skeleton but is poorly preserved are also described. Inozoans and other sponges are major frame-builders in the Permian reefs of South China and our fauna is one of the most diverse late Paleozoic assemblages described to date.


2013 ◽  
Vol 47 (7) ◽  
pp. 641-832 ◽  
Author(s):  
D. S. Aristov ◽  
A. S. Bashkuev ◽  
V. K. Golubev ◽  
A. V. Gorochov ◽  
E. V. Karasev ◽  
...  

2015 ◽  
Vol 49 (10) ◽  
pp. 1150-1159 ◽  
Author(s):  
F. A. Mouraviev ◽  
M. P. Arefiev ◽  
V. V. Silantiev ◽  
N. M. Khasanova ◽  
N. M. Nizamutdinov ◽  
...  

1991 ◽  
Vol 65 (1) ◽  
pp. 45-68 ◽  
Author(s):  
Fan Jiasong ◽  
J. Keith Rigby ◽  
Zhang Wei

Abundant “hydrozoans” are important frame-building and accessory organisms in Middle and Upper Permian reefs of southern China, particularly in western Hubei, eastern Sichuan, eastern Yunnan, and northwestern Guangxi. The new genera Radiotrabeculopora, Lichuanopora, and Pseudopalaeoaplysina are described, as are the new species Disjectopora beipeiensis, D. irregulara, Radiotrabeculopora xiangoboensis, R. maokoui, R. elegans, R. reticulata, R. astrorhiza, Balatonia robusta, Lichuanopora bancaoensis, L.(?) regulara, Pseudopalaeoaplysina sinensis, and P. major. The assemblage represents one of the most diverse upper Paleozoic “hydrozoan” assemblages known.


GeoArabia ◽  
2003 ◽  
Vol 8 (3) ◽  
pp. 467-496 ◽  
Author(s):  
Mike H. Stephenson ◽  
Peter L. Osterloff ◽  
John Filatoff

ABSTRACT Extensive palynological work in sequences in Oman and Saudi Arabia, has allowed a framework of eight biozones for the uppermost Carboniferous to Permian rocks in that region. Five of these are established in the palyniferous uppermost Carboniferous to Lower Permian sequence in Oman, and to some extent these are recognisable in sequences of central and southern Saudi Arabia. OSPZ1 (Oman and Saudi Arabia Palynological Zone 1), associated with the lower parts of the Al Khlata Formation and the Unayzah C member, is probably Stephanian in age. OSPZ2 is Asselian-Sakmarian in age, and is associated with the upper part of the Al Khlata Formation and the Unayzah B member. OSPZ3, which is subdivided into three sub-biozones, is associated with the Lower Gharif member; its age may lie in the range late Sakmarian to Artinskian, based on palynology and brachiopod-based ages for the Haushi Limestone, locally present toward the top of the Lower Gharif member. The composition of assemblages from OSPZ1 to OSPZ3 is similar to that of coeval sequences in other former Gondwana countries and the chronostratigraphical ages assigned to them are partly gained from correlation with faunally-calibrated Western Australian palynological biozones. At the level of OSPZ4, such correlation becomes difficult because significant differences are evident between Western Australian and Arabian assemblages, and because other Gondwana palynological biozonations, with which Arabia has greater affinity, are poorly constrained chronostratigraphically. OSPZ4 and the succeeding two biozones are established in the sporadically palyniferous Middle and Upper Permian sequences of Oman and Saudi Arabia. OSPZ4, though poorly characterised due to low palynological recovery, is probably ‘mid-Artinskian’ to Kungurian in age, and is associated with the Middle Gharif member. OSPZ5, present in southeast Saudi Arabia and Oman appears to be associated with the lower to middle parts of the Upper Gharif member, and is constrained in age, partly by the faunally-dated overlying Oman Khuff carbonates, as being Roadian or earliest Wordian in age. So far the assemblages of the highest biozone, OSPZ6, have been recovered only from the ‘basal Khuff clastics’ of central Saudi Arabia, and are believed to be younger than those of OSPZ5; dating by palynological means is difficult but recent microfaunal studies of the ‘basal Khuff clastics’ suggest a Capitanian age. Further study in appropriate palyniferous sections in other Middle Eastern countries may allow a more complete palynological succession to be established.


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