Oragesee5 with1QRFICGAL:USE ONLY
page 6
Zonation. Correlation using these two benthic groups is
critical because calcareous nannofossils a
planktic
foraminifers are absent in the lower Miocene strata.
Biostratigraphic data from these boreholes delineate a
thick (greater than 700 feet) sequence of upper
Oligocene and lower Miocene strata corresponding to
lower and upper Te zone. These strata document a major
period of carbonate accumulation at Enewetak during the
Late Oligocene and early Miocene (26 to 18 million years
801.
Item
KEYWORD (S)
ago).
ENIWETOK/geologic formations
;GEOLOGIC
FORMATIONS/paleontology ; STRATIGRAPHY; PROTOZOA; BOREHOLES;
MARSHALL ISLANDS; THICKNESS ; CARBONATES ; ENIWETOK; TERTIARY
PERIOD; CORRELATIONS; EXPLORATION; AGE ESTIMATION;
PALEONTOLOGY; ATOMIC EXPLOSIONS
11
PB--91-239061/XAB
Calcareous nannofossils and planktic foraminifers
from Enewetak Atoll, Western Pacific Ocean: Geologic and
geophysical investigations of Enewetak Atoll, Republic
of the Marshall Islands. Professional paper
150.
110.
REPORT NUMBER
PRIMARY TITLE (M)
72.
710.
PERSONAL AUTHOR/AFFIL Bybell, L.M.; Poore, R.&Z@.
CORPORATE SOURCE
Geological Survey, Alexandria,
750.
371.
PUBL.ANNOUNCEMENT
PUB. DATE (YYMMDD)
34.
CLASSIF.
950. ABSTRACT
LEVEL TEXT
VA
(United States)
GRA-91:11922;EDB-92:006530
910000
Unclassified
Boring of the carbonate sequence at the northern
end of Enewetak Atoll,
was conducted in 1985,
Republic of the Marshall Islands,
as part of the Pacific Enewetak
Atoll Crater Exploration (PEACE) Program. The overall
goal of the program was to characterize physical effects
of large-scale nuclear blasts,
which were conducted in
the early 1950's, on the sediments of the atoll. In the
report the authors document the occurrences of
stratigraphically diagnostic planktic microfossils in
samples from Enewetak (generally referred to as core)
and outline the rationale for incorporating all
available diagnostic planktic assemblages into a
801. KEYWORD(S)
composite sequence that was used to date the Enewetak
benthic zonation.
ENIWETOK/geologic surveys ;ATOMIC EXPLOSIONS/BLAST
DAMAGE ; GEOPHYSICAL SURVEYS; SEDIMENTS; PACIFIC OCEAN;
STRATIGRAPHY; CARBONATE ROCKS;MARSHALL ISLANDS; PROTOZOA;
ENIWETORK
Item 12
150.
REPORT NUMBER
NBS--6050
OFFICIAL USE ONLY