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Geological Society, London, Special Publications; 1986; v. 20; p. 145-153;
DOI: 10.1144/GSL.SP.1986.020.01.15
© 1986 Geological Society of London

The lower Silurian graptolites of Oued In Djerane: a study of populations at the Ordovician-Silurian boundary

P. Legrand

Lab. Explor. Group Total, 218-228 Avenue du Haut-Léveque, 33605 Pessac, Cedex, France

Three zones can be distinguished in the Oued in Djerane region, Algerian Sahara, from the bottom to the top: Climacograptus (Climacograptus) tilokensis sp. nov. Zone; Diplograptus(?) kiliani Zone; Glyptograptus (Glyptograptus) tariti Zone. An example of a detailed study of the different forms of the Climacograptus (Climacograptus) normalis group is given. In addition the problem of the Ordovician-Silurian boundary and its application to the Algerian Sahara sequence is discussed.





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W. B. N. Berry and P. Wilde
Graptolite biogeography: implications for palaeogeography and palaeoceanography
Geological Society, London, Memoirs, 1990; 12: 129 - 137.
[Abstract] [PDF]