Jour. Roy. 8oc. Western Australia, Vol. XII, No. 5 53 
Note on two ammonites from the Gin Gin Chalk 
by L. F. Spath, D.Sc., F.G.S. Communicated by L. Glaucri . 
{Read ^larcli 9, 1926. PubU.slicd A])ril 7, 1926.) 
Mr. L. Glauort. F.G.S. of the Wosteni Australian Museum, 
throu^li the kind intervention of Mr. Thomas H. Withers, F.G.S., 
has sent to me for examination two Gindin Chalk ammonites, 
which it is proposed to discuss l)riefly in the following lines. 
The specimens ore labelled No. 3979 (One Tree Hill) and No. 
10101 (three fragments). 
Ainnionites are not common in the Gingin Chalk and appear 
to be always in the condition of crushed or otherwise badly 
preserved casts. The seven examples recorded by R. Etheridge junr. 
in his paper on the ‘^Cretaceous Fossils of the Gingin Chalk”* * * § 
had long puzzled oliserver until Mr. Witherst announced the oc- 
currence of the crinoid IGntacriniis in the Gingin Chalk and 
established the Renonian age of this deposit. In so recent a work 
as Dr. F. R. C. Reed’s “Geology of the British Empire ”t the 
Gingin Chalk was stated to comprise beds ranging from the Albian 
to the Cenomanian, its fauna showing a remarkable resemblance 
to that of corresponding English beds. Some of Etheridge’s 
examples were compared to “ Haploceras^ ’ daintreei Etheridge§ 
and to ^ ‘ Haploceras” fUndcrsi M ’Coy sp.||, of which latter 
‘ ‘Ammonites hexidanti Brongniart, var. mitehelli ’ ’ Etheridge*^ re- 
ferred to by tlie wi'iter on a recent occasion** is said to be a 
Part IX. of Palaeo'ntoh)gical Contributions to the (xeology of W. Aus- 
tralia, (TV.) Geol. Hurv. W. Austral. Bull. No. 55, lOI'i. 
t Joiirn. Roy. Soo. W.A.. vol. XI., No. 2, 1024, i>]». 15-8. 
+ London (l-Xhv. Arnold). 1921. ]>. 1576. 
§ ‘ ‘ J)osfrii>tion of the Palaeozoic and Mesozoic Fossils of Queensland’’ in 
Daintree. ‘‘Geologv of Queensland.'' Quart. Journ. Geol. Soc. vol. 
XXVITT. (1872). pi. XXIV.. figs. 1-2. 
r Trans, Ivoy. Soc. \‘ictoria, vol. VII. (186()), p. 40 (not figured). 
1[ Loc. cit. (1872). p, 245. pi. XXTTI., figs. 1-2. Haplnceras. is a strictly 
Jurassic genus, see L. F. S]>ath ‘‘Ammonites and Aptychi’’ (VII.), 
Collection of Fossils and Rocks from Somalilaml, Monogr. Hunterian 
Mus. Glasgow, I. 1025, ]>. 112. 
** Spath. Monograph, of the Ammonoidea of the Gault. (Pal. Soc.) part T. 
(1921), 1023. 1). 52. 
