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all geography including DSDP/ODP Sites and Legs
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Caribbean Sea
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Europe
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illite (1)
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Primary terms
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Atlantic Ocean
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Equatorial Atlantic (1)
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Mid-Atlantic Ridge (1)
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North Atlantic
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Caribbean Sea
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Venezuelan Basin (1)
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Ceara Rise (1)
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Gulf of Mexico
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Campeche Scarp (1)
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Northwest Atlantic (9)
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Sierra Leone Rise (1)
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South Atlantic
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Angola Basin (1)
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carbon
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Deep Sea Drilling Project
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IPOD
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Leg 48
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DSDP Site 400 (1)
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Leg 72
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DSDP Site 516 (1)
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Leg 73
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DSDP Site 522 (2)
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Leg 74
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DSDP Site 526 (1)
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Leg 80
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DSDP Site 548 (1)
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DSDP Site 549 (1)
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Leg 82
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DSDP Site 558 (2)
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Leg 95
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DSDP Site 612 (3)
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Leg 10
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DSDP Site 94 (2)
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DSDP Site 119 (1)
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Leg 36
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DSDP Site 329 (1)
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Leg 39
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DSDP Site 357 (1)
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Leg 40
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DSDP Site 360 (1)
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DSDP Site 362 (1)
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DSDP Site 363 (1)
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Leg 41
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DSDP Site 366 (2)
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Leg 9
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DSDP Site 78 (1)
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diagenesis (1)
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Europe
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Southern Europe
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Italy
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Marches Italy
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Ancona Italy
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Massignano Italy (1)
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geochemistry (1)
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geophysical methods (1)
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Indian Ocean
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Exmouth Plateau (1)
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Integrated Ocean Drilling Program
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Expedition 342
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IODP Site U1406 (1)
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Invertebrata
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Protista
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Foraminifera (4)
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isotopes
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stable isotopes
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C-13/C-12 (1)
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O-18/O-16 (3)
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metals
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platinum group
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iridium (1)
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metamorphism (2)
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Ocean Drilling Program
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Leg 108
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ODP Site 667 (1)
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Leg 114
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ODP Site 703 (1)
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Leg 122
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ODP Site 763 (1)
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Leg 130
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ODP Site 803 (1)
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Leg 150
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ODP Site 902 (4)
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ODP Site 903 (8)
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ODP Site 904 (6)
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ODP Site 905 (1)
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ODP Site 906 (3)
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Leg 154
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ODP Site 926 (1)
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ODP Site 929 (1)
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Leg 174A
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ODP Site 1072 (1)
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ODP Site 1073 (3)
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Leg 174AX (1)
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Leg 199
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ODP Site 1218 (1)
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ODP Site 1219 (1)
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-
Leg 202
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ODP Site 1237 (1)
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ocean floors (1)
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oxygen
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O-18/O-16 (3)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Monterey Canyon (1)
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Southeast Pacific
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Nazca Ridge (1)
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-
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Equatorial Pacific (1)
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North Pacific
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Northeast Pacific
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Monterey Canyon (1)
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-
Northwest Pacific (1)
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South Pacific
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Southeast Pacific
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Nazca Ridge (1)
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-
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West Pacific
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Northwest Pacific (1)
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Ontong Java Plateau (1)
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-
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paleoclimatology (3)
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paleoecology (1)
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palynomorphs
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miospores
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pollen (1)
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Plantae
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algae
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nannofossils (1)
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-
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plate tectonics (1)
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sea-level changes (3)
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sedimentation (2)
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sediments
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tektites (1)
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United States
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Atlantic Coastal Plain (3)
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California
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Central California (1)
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Maryland (1)
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New Jersey
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Atlantic County New Jersey
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Atlantic City New Jersey (2)
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Cape May County New Jersey (3)
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Ocean County New Jersey (3)
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weathering (1)
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rock formations
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Kirkwood Formation (1)
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sedimentary structures
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channels (1)
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sediments
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sediments
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clastic sediments (1)
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marine sediments (3)
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Leg 150
Precision in Biostratigraphy: Evidence For a Temporary Flow Reversal in the Central American Seaway During Or After the Oligocene-miocene Transition Available to Purchase
Positive Ir anomaly at 6.19 m, Massignano, Italy: Most likely not from the Chesapeake Bay impact Available to Purchase
ABSTRACT Two late Eocene impact spherule layers are known: the North America microtektite layer (from the Chesapeake Bay crater) and the slightly older clinopyroxene (cpx) spherule layer (from Popigai crater). Positive Ir anomalies occur at 5.61 m and 6.19 m above the base of a late Eocene section at Massignano, Italy. The age difference between the two anomalies is ~65 ± 20 k.y. The older Ir anomaly at 5.61 m appears to be associated with the cpx spherule layer. Although no impact spherules or shocked-mineral grains have been found associated with the upper Ir anomaly at 6.19 m, it has been proposed that it may be from the Chesapeake Bay impact. Comparison with other distal ejecta layers suggests that microtektites, but not shocked-mineral grains, from the Chesapeake Bay crater could have been thrown as far as Massignano. However, their absence neither supports nor disproves the hypothesis that the Ir anomaly at 6.19 m is from the Chesapeake Bay impact. On the other hand, the North American microtektite layer is not associated with an Ir anomaly. Furthermore, the average age difference between the cpx spherule layer and the North American microtektite layer appears to be ~18 ± 11 k.y., which is nearly one quarter the age difference between the two Ir anomalies at Massignano. This indicates that the Ir anomaly at 6.19 m is too young to be from the Chesapeake Bay impact, and thus is most likely not from the Chesapeake Bay impact.