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The Famennian and Dinantian of the Zonguldak Basin contain a succession of foraminiferal zones comparable to those of Russia and Western Europe. The foraminiferal assemblage of the Chernyshinella glomiformis zone resembles that of Russia rather than that of Western Europe. The major transgressions (Fa2-Tn1; Tn2; V1; V2b) are comparable to those detected in W. Europe by R. CONIL (Belgium) and W. RAMSBOTTOM (England). All the biofacies encountered are of shallow-water type, often rich in foraminiferans and algae and very poor in conodonts.

A preliminary detailed list of the conodonts from the Fromelennes Formation is established. This formation is subdivided into three members. At three levels faunal changes are clear enough to characterize important biostratigraphic boundaries. Polygnathus rhenanus, P. dubius and leriodus eslaensis latecarinatus n. subsp. characterize the first level, Spatbognathodus insitus and Schmidtognatbus hermanni the second, and Ancyrodella rotundiloba the third. Only the last two levels are taken into account in defining the boundary between the Givetian and the Frasnian and between the Middle and Upper Devonian. The new subspecies, Icriodus eslaensis latecarinatus, is fully described. Diagrams of other important species and subspecies relevant to the problem are given and they are briefly discussed

The sequence of conodont faunas in the Namurian of Belgium is described and compared with faunas of the same age in North America, western Europe and Japan. The faunas exhibit major changes within the Namurian in the Chokerian {HI), Alportian (H2) and Kinderscoutian (Ri) sub-stages involving the appearance of new species and genera and the disappearance of many pre-existing ones.These changes take place at approximately the position of the Mississippian- Pennsylvanian boundary in North America. The palaeontology of these faunas is dealt with in detail and 47 species and sub-species have been recognised amongst which Angulodus simplex, Lonchodina bischoffi, Idiognathoides sulcata sulcata, Idiognathoides sulcata parva, Idiognathoides minuta, Streptognathodus lateralis and Gnathodus bilineatus bollandensis are considered new

The icriodiform, pelekysgnathiform and polygnathiform conodont elements from the Cercadillo Shales and Limestone are described. The icriodiform elements with one or two postero-lateral processes are assigned to three genera : Caudicriodus n. gen., Praelatericriodus n. gen., and Latericriodus MULLER, K. J . , 1 9 5 6 , herein modified. Caudicriodus forms the main branch from which Praelatericriodus in the Lower Gedinnian and Latericriodus in the Lower Emsian are derived.Caudicriodus? culicellus n. sp. is a newly described Upper Emsian - Lower Couvinian species. A number of species and subspecies described in this part and in the second part by P. BULTYNCK (1971) have been chosen in such a way that they form nine faunastic associations, which have a stratigraphical value, those are from oldest to youngest : I the Praelatericriodus rectangularis — Spathognathodus steinhornensis repetitor — Caudicriodus postwoschmidti — fauna (Lower Gedinnian); II the Praelatericriodus rectangularis — Caudicriodus curvicauda — fauna (Siegenian); III the Praelatericriodus simulator — fauna (Siegenian); IV the Caudicriodus celtibericus — fauna (Lower Emsian); V the Caudicriodus sigmoidalis — Polygnathus dehiscens — Spathognathodus steinhornensis miae — fauna (Lower Emsian); VI the Latericriodus bilatericrescens, Polygnathus dehiscens — Spathognathodus steinhornensis miae — fauna (Lower Emsian); VII the Icriodus fusiformis — 1. aff. I. corniger — I. rectirostratus — Caudicriodus ?culicellus — Polygnathus foveolatus (late forme) — fauna (Upper Emsian); VIII the Icriodus aff. /. fusiformis — I. corniger — 1. rectirostratus — Caudicriodus ? culicellus — Polygnathus foveolatus (late form) — fauna (Upper Emsian — Lower Couvinian); IX the Polygnathus serotinus — fauna (Upper Emsian — Lower Couvinian). Age assignements are based on the Brachiopods and on the association with Conodonts.