[ SLL | 
WAVE NUMBER (CM-!) 
4000 3000 2000 1500 1000: 900 800 700 
l L 
! 1 I j 1 
ee 
MONTANA II So! 405 
al H 425 
WS , 
pe a a 
MARTHA’S VINEYARD. we NO m 
\ 
| i i i i L it i 
1 1 1 
4 2 6 F 4 8 9 10 12 13 14 15 
WAVELENGTH (MICRONS) 
Infrared spectra of amber of unknown age from Montana Types II and III 
and Cretaceous amber from Martha’s Vineyard, Mass. 
IXX avid 
