GASTROPODS: TROCHIDAE TO TURRITELLIDAE


r No. USGS used ia Cenozoic ield t1ts5 No. No. report





 153 16950 47


No. USGS
used in Cenozoic Field tOts No. No. report


 Description of locality



 MIDDLE PART OF GATUN FORMATION,
 EASTERN AREA-continued

 Gatun Third Locks excavation, plug at south end of excavation, Canal Zone. Unit 1 of section on p. 44; silty to marly sandstone. T. F.
 Thompson and W. P. Woodring,
 1947.
 Stanford University locality 2657.
 Gatun Third Locks excavation, south end of excavation, Canal Zone.
 Latitude 9'15' N., plus 5,600 feet (1,705 meters), longitude 79'54' W., plus 5,150 feet (1,570 meters).
 Unit 3 of section on p. 44; mediumgrained to very fine-grained sandstone. T. F. Thompson, 1942. 425 feet (130 meters) north of locality
 153. Not plotted.
 Gatun Third Locks excavation, west
 side of excavation 0.6 mile (1 kilometer) north of Gatun Lake, Canal Zone. Unit 10 of section on p. 44; conglomerate. T. F. Thompson and
 W. P. Woodring, 1947.
 Stanford University locality 2653.
 Gatun Third Locks excavation, Canal Zone. Latitude 916' N., plus 4,700 feet (1,430 meters), longitude 79054' W., plus 5,800 feet (1,770 meters). Units 11 and 12 of section on p. 44; fine-grained sandstone and marly siltstone. T. F.
 Thompson, 1942.
Spoil dump of Gatun Third Locks
 excavation, Canal Zone. T. F.
 Thompson, 1945. [Essentially same stratigraphic range as locality 155.]
 Not plotted.
Spoil dump of Gatun Third Locks
 excavation, Canal Zone. T. F.
 Thompson and W. P. Woodring, 1947. Essentially same stratigraphic range as locality 155. Not
 plotted.
Gatun Third Locks excavation, east
 side of excavation 1 mile (1.6 kilometers) north of Gatun Lake, Canal Zone. Turritella-bearing marly siltstone in lower part of unit 12b of section on p. 44. T. F. Thompson and W. P. Woodring, 1947. Included in stratigraphic range of
 locality 155. Not plotted.
Jadwin Road at crossing of Panama
 Railroad, northern part of Gatun, Canal Zone. Turritella-bearing
 -:' I 7 rvi_


159C 160


160a









161




161a 6lht 161c 61d


16926 56 2682 17 5211

5414 6273 _


5846 8369









8365




8395 8375 8382 8366


 157 158 159

159a


 Description of locality



 MIDDLE PART OF GATUN FORMATION,
 EASTERN AREA-continued

 Westernmost cut on Panama Railroad cutoff south of Fort Davis, 1.2 miles (1.9 kilometers) northeast of Gatun railroad station, Canal Zone. Siltstone and silty sandstone. W. P.
 Woodring, 1947.
 Vamos 4 Vamos, Canal Zone. R. T.
 Hill, 1895. [Locality erroneous; it apparently should be "French Canal, 10.5 kilometers from Coldn"; that is, near Gatun. See remarks under
 locality 173a.] Not plotted.
 Lock site at Gatun, Canal Zone.
 W. S. Standifer, 1909. Not plotted. Upper lock site at Gattn, Canal Zone.
 W. J. Ergenzinger, 1910(?). Not
 plotted.
 Lock site [at Gatun], Canal Zone, 10
 to 50 feet (3 to 15 meters) below surface. Dan St. Clair, 1912(?).
 Not plotted.
 Near Gatun Dam site, Canal Zone.
 D. F. MacDonald, 1911. Not plotted.
Near spillway at Gatun Dam site,
 Canal Zone. D. F. MacDonald,
 1911.
Chagres Dam spillway, station 5,
 Canal Zone. Just above contact with Caimito sandstone. A. A.
 Olsson, 1918. [At or near locality
 160.] Not plotted.

MIDDLE PART OF GATUN FORMATION,
 WESTERN AREA

Railroad cuts west of Gatun Dam,
 station C, Canal Zone. A. A.
 Olsson, 1918. Location approxinate.
Railroad cuts west of Gatun Dam,
 station D, Canal Zone. A. A.
 Olsson, 1918. [Near locality 161.]
 Not plotted.
Cuts west of Gatun Dam, station 4
 plus 5, Canal Zone. A. A. Olsson, 1918. [Near locality 161.] Not
 plotted.
Railroad cuts est of Gattun Dana,
 statiott B, Canal Zone. A. A.
 Olsson, 1918. [Near locality 161.]
 Not plotted.
Cuts west of Gatun Dam, station 3a,


154 1 16935


155


155a 16970


16949


155c 1 16915


49






50


156


16928 | 13


I~.


127