350, H 416, and H 420(Plate XIX). <All of this amber 
is opaque, with the color varying from light beige to 
streaks of almost black. The variation in the spectra ap- 
pear to be due largely to intensity and resolution of the 
bands. Roebling Type I resembles the Magothy River 
family of spectra. 
Amber from Harrisonville, N.J. (Gloucester Co.) was 
reported by Kunz (1883). It was found from 20 to 28 
feet under a green sand or marl! containing invertebrate 
fossils which were considered ‘‘to belong to the middle 
bed of the Upper Cretaceous series.’’ Kunz indicated 
that no analysis had been made of this amber, but he 
felt “‘the similarity in specific gravity, hardness and igni- 
tion leaves little doubt of its being true amber, or of its 
having been derived from a gum closely resembling that 
which is the source of the Baltic and other ambers.’”’ 
The spectrum H 409 (Plate XX) disproves this rela- 
tionship completely. The Harrisonville amber differs 
from almost all other fossil resins in that it lacks a well 
defined carbonyl group. Carbon-carbon unsaturation 
causes a sharp absorption band at 6.1 (1650 cm!) of 
such intensity that the broader hydroxy] absorption in 
this region fails to obscure it. The distinctive pair of 
bands at 13.84 and 14.34 (750 cm-! and 700 em:!) is 
clear evidence for the presence of mono-substituted ben- 
zenoid rings. ‘This indicates a composition similar to 
that of the European fossil resin siegburgite which has 
been related to Liquidambar by chemical studies in 
which cinnamic acid and styrene were isolated (Klinger 
and Pitschki, 1884). hese aromatic resins form a small 
but distinctive family of their own, which differ dramati- 
cally from the usual terpenoid resins which alone can be 
called ‘‘true amber.”’ 
The resin from Pemberton, N.J. (H 417, Plate XX) 
is of the same aromatic type as the Harrisonville sample 
[ 86 | 
