GASTROPODS: TROCHIDAE TO TURRITELLIDAE


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


No. USGS used in Cenozoic this No. report


115b 1 6443


 Description of locality



 CULEBRA FORMATION, GAILLARD CUT,
 CANAL ZONE-continued

A mile (1.6 kilometers) south of Culebra Cut. Ralph Arnold and D. F.
 MacDonald, 1913. [The locality data are indefinite, but this presumably is the collection to which MacDonald referred in a notation on his label for 6515: "Arnold took fossils from here."] Not plotted;
 evidently same as locality 115a. West side of Culebra [Gaillard] Cut,
 canal station 1863. Pebbly tuffaceous sandstone about 2.5 feet (75 centimeters) thick. D. F. MacDonald, 1911. Also coral (Vaughan, 1919a, p. 208, cited as locality 5863).
 Plotted on plate 2.
 EMPERADOR LIMESTONE MEMBER OF CULEBRA FORMATION, CANAL ZONE
Limestone on street near railroad at
 Empire, 0.25 or 0.3 mile (400 or 500 meters) north-northwest of railroad station. D. F. MacDonald and T. W. Vaughan, 1911 (MacDonald, 1919, pl. 154). Plotted on plate 2; location approximate, based on MacDonald's plotted location.
Old quarry 0.3 mile (500 meters) westnorthwest of Empire. D. F. MacDonaid and T. W. Vaughan, 1911 (MacDonald, 1919, pl. 154). Also corals (Vaughan, 1919a, p. 208-209).
 Plotted on plate 2, location approximate, based on MacDonald's plotted
 location.
Quarry at Empire. Ralph Arnold,
 1913. Not plotted; presumably
 same as locality 118 or nearby.
Lower part of upper limestone near
 tower N. Thought to be equivalent of fossil lot 6a [5856], but bed is not directly traceable. D. F. MacDonald, 1911. [Tower N was a signal tower on the original line of the Panama Railroad near Las Cascades.
 The right-of-way, still recognizable at some places as a low artificial ridge, immediately adjoins the left bank of the canal in the Las Cascades area. Locality 119 presumably is near locality 120.] Not
 plotted.
 Upper limestone bed near tower N.
 Same as fossil lot 6c [5858]. D. F.
 MacDonald, 1911. Also larger Foraminifera (Cole, 1953a). Not
 plotted; same as locality 119.


5856


120 1 16958


120a 121


8043 16941


122 6012e


123


124 125


16955


5852


Description of locality


119b 119c


6669 L


 EMPERADOR LIMESTONE MEMBER OF
 CULEBRA FORMATION, CANAL ZONEcontinued

 .--_ Upper bed of limestone near tower N.
 D. F. MacDonald, 1913. Not
 plotted; same as locality 119.
-- Highest limestone near tower N, between towers 51 and N. D. F. MacDonald, 1911. Not plotted; near
 locality 119.
 35 West side of Gaillard Cut, canal station 1600. Calcareous siltstone and limestone. T, G. Moran and W. P.
 Woodring, 1947. Plotted on plate 2. ..---_ Las Cascades [west side of Gaillard
 Cut, canal station 1600]. Limestone. W. P. Woodring, 1917. Not
 plotted; same s locality 120.
 34a West side of Gaillard Cut, canal station 1619. Limestone overlying clay and siltstone. T. G. Moran and W. P. Woodring, 1947. Not plotted;
 same as locality 101.

 CUCARACHA FORMATION, CANAL ZONE

- P---- East side of Gaillard Cut, one-eighth
 mile (200 meters) north of Gold Hill [near canal station 1775]. Black carbonaceous shale. D. F. MacDonald and T. W. Vaughan, 1911 (MacDonald, 1919, p. 535-536).
 Plotted on plate 2.

 LA BOCA MARINE MEMBER OF PANAMI
 FORMATION, CANAL ZONE

 33 East of Gaillard Cut, 200 meters up
 Rio Masambi from east bank of canal. Rio Masambi enters the canal at canal station 1696. Coralliferous limestone at base of La Boca member. T. G. Moran and W. P.
 Woodring, 1947. Plotted on plate
 2.
 32 East side of Gaillard Cut, canal station
 1702. Dark, almost black mudstone. T. G. Moran and W. P.
 Woodring, 1947. Smaller Foraminifera. Plotted on plate 2.
---P-- East side of Gaillard Cut near Empire
 bridge. [The Empire bridge was located approximately at canal station 1709.] D. F. MacDonald, 1911.
 Plotted on plate 2; location approximate.


116 1 5853


123


117


118a


6014 6016








6444 5858


119a 1 5866


Field No.