INTRODUCTION


 Includes Clementia dariena, which occurs in Gatun
 formation and is doubtfully recorded from Culebra
 formation.
 1927. Vaughan, T. W., Larger Foraminifera of the genus Lepidocyclina related to Lepidocyclina mantelli: U. S.
 Nati. Mus. Proc., v. 71, art. 8, 5 p., 4 pls.
 Includes Lepidocyclina miraflorensis.
 1927. Palmer, K. V. W., The Veneridae of eastern America, Cenozoic and Recent: Palaeontographica Americana, v. 1, no. 5, 428 p., 45 pls.
 Includes described fossil species from the Canal
 Zone.
 1927. Hodson, Floyd, Hodson, H. K., and Harris, G. D.,
 Some Venezuelan and Caribbean mollusks: Bull.
 Am. Paleontology, v. 13, no. 49, 160 p., 40 pls.
 Includes species from Gatun formation.
 1929. Anderson, F. M., Marine Miocene and related deposits
 of north Colombia: Calif. Acad. Sci. Proc., 4th ser.,
 v. 18, no. 4, p. 73-213, pis. 8-23.
 Includes mollusks collected from Gatun formation
 at spillway of Gatun Dam.
 1930. Li, Chih Chang, The Miocene and Recent Mollusca of
 Panama Bay: Geol. Soc. China Bull., v. 9, p. 249279, 8 pls., map.
 Includes species characteristic of Gatun formation, stated to have been dredged at Pacific entrance
 to canal.
 1930. Rutsch, R., Einige interessante Gastropoden aus dem
 Tertidr der Staaten Falc6n und Lara (Venezuela): Eclogae Geol. Helvetiae, Band 23, p. 604-614, pl. 17.
 Type of Distorsio gatunensis is discussed and
 illustrated.
 1930. Reeves, Frank, and Ross, C. P., A geologic study of the
 Madden Dam project, Alhajuela, Canal Zone: U. S.
 Geol. Survey Bull. 821, p. 11-49, pls. 4-13, figs. 1-5.
 Geology of Madden Dam site and area to be
 flooded by Madden Lake.
1931. Pilsbry, H. A., The Miocene and Recent Mollusca of
 Panama Bay: Acad. Nat. Sci. Phila. Proc., v. 83,
 p. 427-440, pl. 41, 3 figs.
 Eight of the species described by Li in 1930 are
 Miocene fossils. One (Clementia dariena) is labelled "Gatun Locks and Spillway" and all have matrix characteristic of Gatun formation at and near Gatun. 1931. Hodson, Floyd, and Hodson, H. K., Some Venezuelan
 mollusks: Bull. Am. Paleontology, v. 16, no. 59,
 94 p., 24 pls.
 Includes Macoa gatunensis.
1932. Vaughan, T. W., and Cole, W. S., A new species of
 Lepidocyclina from the Panama Canal Zone: Washington Acad. Sci. Jour., v. 22, p. 510-514, 9 figs.
 Lepidocyclina pancanalis is described. The type
 locality, which is also the type locality of Miogypsina panamensis and Nummulites panamensis, represents Caimito formation, but is not so specified [locality
 56 of present report].
1933. Vaughan, T. W., Studies of American species of Foraminifera of the genus Lepidocyclina: Smithsonian
 Misc. Coll., v. 89, no. 10, 53 p., 32 pls.
 Includes Lepidocyclina canellei and L. vaughani. 1934. Collins, R. L., A monograph of the American Tertiary
 pteropod mollusks: Johns Hopkins Univ., Studies
 in Geology, no. 11, p. 137-234, pls. 7-14.
 Includes a species from Gatun formation, Vaginella caribbeana.


9


1936. Tucker, H. I., The Atlantic and Gulf coast Tertiary Pectinidae of the United States: Am. Midland
 Naturalist, v. 17, p. 471-490, 4 pis.
 Includes Pecten macdonaldi, from Toro limestone
 member of Chagres sandstone.
 1937. Coryell, H. N., and Embich, J. R., The Tranquilla shale (upper Eocene) of Panama and its foraminiferal fauna: Jour. Paleontology, v. 11, p. 289-305, pls.
 41-43, 1 fig.
 Foraminifera from a locality on RIo Chagres,
 now flooded by Madden Dam.
 1937. Coryell, H. N., and Fields, Suzanne, A Gatun ostracode
 fauna from Cativa, Panama: Am. lus. Novitates
 956, 18 p., 47 figs.
 Ostracodes from lower part of Gatun formation. 1941. Vaughan, T. W., and Cole, Wi. S., Preliminary report on
 the Cretaceous and Tertiary larger Foraminifera of Trinidad, British West Indies: Geol. Soc. America
 Special Paper 30, 137 p., 46 pls., 2 figs.
 Includes Operculinoides panaensis.
 1941. Merriam, C. W., Fossil Turritellas from the Pacific coast
 region of North America: Calif. Univ., Dept. Geol.
 Sci., Bull., v. 26, no. 1, p. 1-214, pls. 1-41, 19 figs.
 Turritella altilira is illustrated.
 1942. Olsson, A. A., Tertiary deposits of northwestern South
 America and Panamd: Eighth Am. Sci. Cong. Proc.,
 v. 4, p. 231-287.
 Tertiary formations of Panami.
 1943. [Thompson, T. F.], Geology: Panama Canal, Dept. Operation and Maintenance, Special Eng. Div., Third
 Locks Project, pt. 2, chap. 3, 33 p., 21 figs.
 General discussion of geology of Canal Zone. 1943. [Thompson, T. F.], Foundations and slopes: Idem, pt. 2,
 chap. 5, 138 p., 6 pls., 136 figs.
 Detailed geology of Third Locks sites.
 1944. Thompson, T. F., Geological explorations in the vicinity
 of Rio Quebrancha for the Panama Cement Company: Panama Canal, Dept. Operation and Maintenance, Special Eng. Div., 34 p., 10 pls., 4 figs.
 Geology of part of Quebrancha syncline, east of
 Canal Zone.
1945. Nicol, David, Restudy of some Miocene species of
 Glycymeris from Central America and Colombia:
 Jour. Paleontology, v. 19, p. 622-624, pl. 85.
 Includes Glycymeris canalis.
1946. Vaughan, T. W., Initiation of geological investigations in
 the Panama Canal Zone: Science, v. 104, no. 2696,
 p. 209.
 Geologic investigations during construction period
 after 1910 are attributed to a suggestion from
 Lord Bryce to President Taft.
1946. Keen, A. M., and Thompson, T. F., Notes on the Gatun
 formation (Miocene), Panama Canal Zone (abstract):
 Geol. Soc. America Bull., v. 57, p. 1,260.
 Three faunal zones are recognized.
1947. Nicol, David, Tropical American species of Glycymeris
 from the Tertiary of Colombia, and a new species from Panama: Jour. Paleontology, v. 21, p. 346-350,
 pl. 50.
 Includes Glycymeris schenchi from Gatun formation.
1947. MacDonald, D. F., Panama Canal slides: Panama Canal,
 Dept. Operation and Maintenance, Special Eng.
 Div., Third Locks Project, 73 p., 52 pls., 5 figs.