pines. Anatomical features do not supply evidence for 
distinguishing particular species of pine. The amber pines 
characteristically had low production of wood and strong 
production of bark. The production of resin occurred not 
only in the epithelial cells of the resin canals, but to still 
greater extent in parenchymatous cells of the inner liv- 
ing bark. 
Although pines provide the most probable source of 
abundant resin among the genera known to have occurred 
in this forest, other trees occasionally have been suggested 
as possible additional contributors. The variety of chemi- 
cal and physical properties evident in the amber produces 
suspicion of the possibility of several kinds of source trees 
for the resin. Examination for plant remains in stantien- 
ite, beckerite, glessite and gedanite, recognized for their 
distinctive chemical properties, unfortunately does not 
yield conclusive evidence of other kinds of trees. 
Stantienite contains a few specimens of a three-needle 
pine, and wood and bark remains of maple. Beckerite 
has remains of Sequova, ferns and a cycad. However, 
Schubert (1961) felt that this material has abundant in- 
sect larval debris and decomposition products that ob- 
scure its basic composition, and hence its composition 
might not be sufficiently different to have come from a 
tree other than pine. Fragments of wood, bark and 
leaves, as well as many insects, have been obtained from 
gedanite. Schubert (1961) again indicated that, despite 
the chemical and physical differences, the preponderant 
evidence from the remains is that of a pine-type. There- 
fore, he considered that the chemical differences must be 
explained in terms of some type of variation produced 
within the pine group. Glessite has practically no inclu- 
sions that have been observed, but it is thought to be 
chemically similar to ‘‘benzoin.*’? This suggests a mem- 
ber of the Styracaceae. Remains similar to Styraa ben- 
[ 254 ] 
