APPENDIX 
Following is a brief lithologic description of the samples studied. 
Locality numbers in parentheses with ‘‘B’’ and “*D’’ prefixes refer 
to materials on loan to the Botanical Museum of Harvard University 
from collections of the University of California Museum of Paleon- 
tology. Locality numbers with ‘*Pl’’ prefixes are in the Harvard 
University Paleobotanical collections. 
Sample I (D-621) was collected from the landslide on the east side 
of the village of Simojovel. It is a brownish to reddish, coarse-grained 
siltstone, including fine seams of lignitic material. 
Sample II (Pl-32) was collected upstream from Mazantic from a 
5-10 foot lignitic bed containing amber. 
Sample III (P1-7) was collected from Pabuchil (Rancho Alegre) 
slide two miles northwest of Simojovel. It is a sandy, dark-grey cal- 
careous silt stone from an amber-bearing interval with marine fossils. 
Sample IV (PI-8) was collected at an outcrop along the road to 
Huitiupan. It is a leached calcareous sandstone with carbonaceous 
sandstone with carbonaceous streaks and contained fairly abundant 
amber. 
Sample V (B-4178) was collected at the Portugal (also known as 
Santa Catarina) slide on the north side of the Ri6é Ancora valley. It 
is a greyish-brown siltstone containing marine fossils from a bed im- 
mediately below the amber-bearing strata. 
Sample VI (B-4177) also was collected at Portugal slide from a blue 
silty clay 100 feet in the section above Sample V and 4-5 feet above 
a thin lignitic zone. 
Sample VII (P1-33) was collected at the Las Cruces slide about 15 
miles southeast of Simojovel. It is a brownish, coarse-grained silt- 
stone with some lignitic material, from a 4-8 foot lignitic interval 
immediately above beds containing amber. 
Sample VIII (D-614) was collected from a marine glauconitic sandy 
shale at Mina Palo Blanco, Finca La Primavera on the San Pedro 
River northwest of Simojovel. 
Sample IX (D-615) was collected from a marine black silty-shale at 
Mina Palo Blanco from the bed immediately above the previous sample. 
Sample X (B-8106) is a marine glauconitic silty-shale collected at 
Mina de Naranjo, Finca La Primavera. 
Sample XI (B-8105) is a marine glauconitic silty-shale collected at 
Mina de Naranjo. 
Sample XII (B-4180) was collected at Jolpabuchil. It is a greyish- 
black carbonaceous siltstone with marine fossils. 
[ 824 ] 
