262 REPORTS ON THE STATE OF SCIENCE, ETC. 
Zaphrentid-Cyathaxonia phase and Culm phase. 
If it is felt that there is a need (which is doubtful) of a symbol to indicate the 
occurrence of a Zaphrentid phase or a goniatite-lamellibranch fauna at any particular 
horizon, it is suggested that the scheme proposed by Sibly !2 be adopted. Indices 
such as D, and §, should be indicative of horizon, and faunal phase should be indi- 
cated by the addition of small letters, e.g. Dox. a Zaphrentid phase of D, age, Ds,, 
a goniatite phase of D, age, or Hy, a coral-brachiopod fauna of H age. In general, 
however, and certainly for the goniatite phase, the phasal character should be indicated 
by the index fossil. There is no agreement among members of the Committee 
as to the use of the index letter P. Originally detined by Vaughan as the zone of 
Posidonomya, and including beds now recognised as D, (pars), D, and O ?, it was 
later commonly used for beds rich in goniatites and lamellibranchs ; that is, it denoted 
a Culm faunal phase. As the Committee has agreed that such phases should be 
indicated by the small letter p used after the zonal index, there is no need for P as a 
phasal index. In 1924 Bisat re-defined P as the zone of ‘ G. crenistria and probably 
that of any members of the genus Goniatites (s. str.),’ and some members of the Com- 
mittee are in favour of retaining P as the index letter of that zone, while others favour 
its total abandonment and the use of an index such as G for the zone of G. crenistria.™ 
Table II. is a provisional one (pending further work now in progress) showing 
the general relations between the various areas of the Midland and Craven Provinces, 
and also their approximate correlation to the Yoredalian. The correlation has 
been made mainly by the occurrence of the knoll and standard limestone brachiopod 
faunas and by the occurrence of G. crenistria. No attempt has been made to show the 
relation of the higher goniatite zones to the Yoredalian. It is probable that the 
Yoredalian may be, in part, equivalent to part of the Lancastrian (Bisat). 
12 “The Carboniferous Limestone of the Cardiff District.’ Proc. Geol. Ass. vol. xxxi., 
1920, p. 81. 
18 Sub-report II., W. S. B. and others. 
