GEOLOGY AND PALEONTOLOGY OF CANAL ZONE


member. The type locality of L. vaughani is in the type region of the Caimito formation on the Panama Railroad near Darien: locality 49, which was referred to the Emperador limestone member of the Culebra formation by MacDonald and Vaughan (MacDonald, 1919, p. 539, locality 6021). Seven samples of larger


Foraminifera were submitted to W. S. Cole, who identified the species in the following table. Recently Cole (1957, p. 314) also recorded 8 species from their Caimito of Barro Colorado Island, all except one ob which occur in the Caimito elsewhere. The exception is Archaias compressus, which is still living.


Larger Foraminifera from Caimito formation of Gatun Lake area, Rio Mandinga area, and Quebrancha syncline
 [Cole, 1952 (1953), p. 7]
 Localities

 Gatun Lake area Ma- b dinga cha area syn.
 Cline


Operculinoides panamensis (Cushman)-__ ---____-..__-__-_-___ --_____ ------Heterostegina antillea Cushman ----_ -- ______._____ ____- -----------------------israelskyi Gravell and Hanna--------------------------------------------------panamensis Gravell--------------------------------------------------------------Lepidocyclina (lepidocyclina) asterodisca Nuttall-----------------------------------------(Lepidocyclina) canellei Lem oine and R D ouvillM _----_- _- __-__-parvula C ushm an _-- __- .---_ -- _________- _____---------------------------waylandvaughani Cole ------ ---- ---------------------------------yurnagunensis Cushman------------------------------------------------------yurnagunensis morganopsis Vaughan-_-_-____ ---_ -___- _-----(Nephrolepidina) dartoni Vaughan_ _- ____- __-- _______-_-_---------------------tournoueri Lemoine and R. Douvill6
 vaughani Cushman-- ----_- ___- ____--------------------------------(Eulepidina) undosa Cushman------------------------------------------------------Miogypsina (Miogypsina) antillea (Cushman)--------------------------------------------(Miolepidocyclina) panamensis (Cushman)-------------------------------------------


Middle member


48 51


53


I __________________ I -


X


X

/
X


X

X


x



x


X

X


56a

X

X
X


X

X


X


Upper mem
ber


No members recognized


58 59


X


X


X


Quebran-. cha lime. stone mem
ber
62a


X

x


x
x
X

X

X
X


_I __ I I I I I I


 All the species in the preceding table occur elsewhere in deposits of late Oligocene age. Though the table does not include the calcareous siltstone member of the Quebrancha syncline, Lepidocyclina canellei has been recognized by R. H. Stewart in that member (Woodring and Thompson, 1949, p. 234).
 Corals.-MacDonald and Vaughan found corals in the middle member of the Caimito formation of the Gatun Lake area at localities 52 (Geological Survey 6024b) and 57 (Geological Survey 6026). Locality 52 was assigned to the Emperador limestone [member of the Culebra formation] and locality 57 to the Culebra


formation (MacDonald, 1919, p. 540, 541). Four of the seven species identified by Vaughan occur in the upper Oligocene Antigua formation of the island of Antigua and one in the lower Miocene Anguilla formation of the island of Anguilla (Vaughan, 1919a, p. 208, 209). Numerous specimens of a coral in limestone of the Caimito at locality 61 in the Rio Mandinga area is identified by J. W. Wells as Goniopora cf. G. cascadensis.
 Mollusks.-Mollusks have been found in the areas described in the preceding pages, but they are nowhere abundant. The species covered in chapter A of the present report are as follows:


30


T


4