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This suggestion has not been accepted by other workers (Chauvel & Guerrak 1989; Kearsley 1989). The material illustrated by Champetier et al. appear to show normal ironstone ooids. The central cavity described by them appears to be due to the loss of the ooid core during specimen preparation and the lunate divisions are the equatorial thickenings of cortical sheaths so common in berthieroid ooids (Siehl & Thein 1989). Chauvel & Guerrak (1989) also indicate that the Devonian example given by Champetier et al.
In the same manner, therefore, that the 'Lincolnshire Limestone' has now been formally embraced by the Lincolnshire Limestone Formation (Ashton 1980), the 'Cleveland Ironstone' has now been formalized as the Cleveland Ironstone Formation (Howard 1985); the terms Limestone and Ironstone in these names being purely qualifiers indicating the dominant lithology. The form 'Cleveland Iron-Formation' (Iron-formation sensu Trendall 1983) would not be desirable as a formal lithostratigraphic term, because it contains no formal indication of rank, but does contain the word 'formation' suggesting to a reader that it is of formation rank; formal lithostratigraphic units with names such as 'Cleveland IronFormation Member' would be highly undesirable.
Lmprimerie Nationale, Paris. , HAMBADOU,E. & HAMBODOU, H. 1987. Examples of biogenic support of mineralisation in two oolitic iron ores--Lorraine (France) and Gara Djebilet (Algeria). Sedimentary Geology, 51,249-255. CHAUVEL, J. J. & GUERRAK, S. 1989. Oolitization processes in Palaeozoic ironstones of France, Algeria and Libya. P. G. (eds) Phanerozoic Ironstones, Geological Society, London, Special Publication, 46, 165 - 174. L. 1985. Geochemistry of diagenetic non-silicate minerals: kinetic considerations.