AMBER OF UNKNOWN AGE 
The geologic age and paleobotanic information are not 
available for a number of amber collections. ‘These col- 
lections are being presented separately, although they 
will be related to ambers of known age wherever this 
appears justifiable. 
Greenland Amber 
‘T'wo spectra were made of amber from Hare Island in 
Greenland from a collection from Museum fiir Natur- 
kunde, Berlin. The amber occurred as droplets in coal. 
The spectrum (H 165) is poorly developed, due probably 
to oxidation (Plate XV). This amber is assumed to be 
Cretaceous, because of the extensive, well known Cre- 
taceous plant fossil localities in this area of Greenland, 
although there is no direct confirmation of this age. 
Montana Amber 
Nine spectra were run of the amber from Montana. 
Collections were available from the United States 
National Museum and the New York Museum of Natu- 
ral History. No geologic age is indicated for this amber. 
Four spectra were made from the USNM Collection 
#112822, listed only from ‘‘Montana.’’ They are repre- 
sented by the Type I pattern represented by H 404(Plate 
XX). This is the third example of the aromatic series de- 
scribed above from Pemberton, N.J. (H 417) and Har- 
risonville, N.J.(H 409). The Montana sample is virtually 
indistinguishable from that from Pemberton. Both lack 
the broad absorption band of the Harrisonville sample 
between 9 and 10p (1110-1000 em-!) which we have as- 
signed to silicate impurities. 
Five spectra were run from the N.Y. Museum of 
Natural History collection £18395, listed from Washoe, 
Montana. Four spectra gave the pattern of Type II 
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