RAYMOND: CORRELATION OF THE ORDOVICIAN STRATA. 275 
1. Green, white, and red sandstone with numerous frag- 
ments of Obolus. Base not seen. 6 ft. = 6 ft. 
Zones 1 and 2 represent the Packerort formation. 
SEcTION AT Narwa. (Given by Schmidt (47) in the Guide for the 
excursions of the St. Petersburg meeting of the International Geo- 
logical Congress). 
Cig. Echinosphaeritenkalk. Dolomite. 3.0m. = 16.9 m. 
C;,. Upper Linsenschicht. 3m. = 13.9 m. 
Big. Vaginoceras limestone. Dolomite. 3.0m. = 13.6 m. 
Birra. Lower Linsenschicht. 3m. = 10.6 m. 
B,,. Glauconite limestone. 3.3:m. = 10:3.m. 
B,. Glauconite sandstone with concretions of bituminous 
limestone with Dictyonema. 2m.= 7. m. 
Ay. Red Obolus sandstone showing cross-bedding. 2.6 m. = 6.8 m. 
A,,. White fucoidal sandstone with sand concretions. ; 
4.2m.= 4.2m. 
Narwa. (Measured by the writer). Plate 6. 
8. Gray limestone, dolomitic, heavy-bedded, and with few 
fossils at the top, thin-bedded and with numerous 
Orthoceratites in the lower portion. 10 ft. = 36 ft. 10 in. 
7. Linsenschicht. 15 in. = 26 ft. 10 in. 
Zones 7 and 8 represent the Kunda formation. 
6. Hard thick-bedded gray limestone. 3 ft! =;25 ft 7.in. 
5. Impure red limestone with numerous M. planilimbata. 
Top layer a much weathered rusty one, full of holes. 
Sf. Ze hi 7 in. 
4. Red clay-shale. 3in. = 14 ft. 7 in. 
3. Green clayey sand. 4in. = 14ft.4in. 
Zones 3-6 represent the Walchow formation. 
2. Yellow, white and reddish massive and cross-bedded 
sandstone with very numerous Obolus. At the base is 
a layer of rounded, hard, sandstone pebbles, three, four, 
and ten inches in diameter. Much pyrites in lower two 
or three feet, sometimes in hard layers. 11 ft. = 14 ft. 
Zone 2 represents the Packerort formation. 
1. Almost white, thin-bedded sandstone. Base not seen. 
3 ft. = 3 ft. 
Zone 1 represents the Esthonia formation. 
