Update search
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
Format
Article Type
Journal
Publisher
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Atlantic Ocean
-
North Atlantic
-
Caribbean Sea
-
Venezuelan Basin (1)
-
-
Goban Spur (1)
-
Gulf of Mexico
-
Campeche Scarp (3)
-
-
Northwest Atlantic (2)
-
-
-
Atlantic region (1)
-
Chesapeake Bay impact structure (1)
-
Europe
-
Southern Europe
-
Italy
-
Marches Italy
-
Ancona Italy
-
Massignano Italy (1)
-
-
-
-
-
Western Europe
-
United Kingdom
-
Great Britain
-
England
-
Hampshire Basin (1)
-
-
-
-
-
-
North America
-
Gulf Coastal Plain (2)
-
-
Pacific Ocean
-
East Pacific (1)
-
North Pacific
-
Mid-Pacific Mountains (1)
-
-
-
United States
-
Alabama (1)
-
Mississippi
-
Clarke County Mississippi (1)
-
Hinds County Mississippi (1)
-
Wayne County Mississippi (1)
-
-
Texas
-
Burleson County Texas (1)
-
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (2)
-
-
isotope ratios (2)
-
isotopes
-
stable isotopes
-
C-13/C-12 (2)
-
O-18/O-16 (2)
-
-
-
metals
-
platinum group
-
iridium (1)
-
-
-
oxygen
-
O-18/O-16 (2)
-
-
-
fossils
-
Invertebrata
-
Mollusca
-
Gastropoda (1)
-
-
Protista
-
Foraminifera (3)
-
Radiolaria
-
Osculosida
-
Nassellina (1)
-
-
-
-
-
microfossils (7)
-
palynomorphs
-
Dinoflagellata (1)
-
-
-
geochronology methods
-
paleomagnetism (2)
-
-
geologic age
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene
-
middle Eocene (1)
-
upper Eocene
-
Shubuta Member (1)
-
Yazoo Clay (1)
-
-
-
Oligocene
-
lower Oligocene (1)
-
-
-
-
-
-
minerals
-
carbonates
-
calcite (1)
-
-
-
Primary terms
-
Atlantic Ocean
-
North Atlantic
-
Caribbean Sea
-
Venezuelan Basin (1)
-
-
Goban Spur (1)
-
Gulf of Mexico
-
Campeche Scarp (3)
-
-
Northwest Atlantic (2)
-
-
-
Atlantic region (1)
-
carbon
-
C-13/C-12 (2)
-
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene
-
middle Eocene (1)
-
upper Eocene
-
Shubuta Member (1)
-
Yazoo Clay (1)
-
-
-
Oligocene
-
lower Oligocene (1)
-
-
-
-
-
climate change (1)
-
Deep Sea Drilling Project
-
IPOD
-
Leg 48
-
DSDP Site 400 (1)
-
-
Leg 72
-
DSDP Site 516 (1)
-
-
Leg 73
-
DSDP Site 522 (1)
-
-
Leg 74
-
DSDP Site 526 (1)
-
-
Leg 77
-
DSDP Site 540 (1)
-
-
Leg 80
-
DSDP Site 548 (2)
-
DSDP Site 549 (2)
-
DSDP Site 550 (1)
-
-
Leg 82
-
DSDP Site 558 (1)
-
DSDP Site 563 (1)
-
-
Leg 95
-
DSDP Site 612 (1)
-
-
-
Leg 10
-
DSDP Site 86 (1)
-
DSDP Site 94 (9)
-
DSDP Site 95 (2)
-
DSDP Site 96 (1)
-
-
Leg 12
-
DSDP Site 119 (1)
-
-
Leg 14
-
DSDP Site 144 (1)
-
-
Leg 15
-
DSDP Site 149 (2)
-
-
Leg 2
-
DSDP Site 10 (1)
-
-
Leg 3
-
DSDP Site 14 (1)
-
DSDP Site 19 (1)
-
DSDP Site 20 (1)
-
DSDP Site 22 (1)
-
-
Leg 36
-
DSDP Site 329 (1)
-
-
Leg 39
-
DSDP Site 357 (1)
-
-
Leg 40
-
DSDP Site 360 (1)
-
DSDP Site 362 (1)
-
DSDP Site 363 (1)
-
-
Leg 41
-
DSDP Site 366 (1)
-
-
Leg 43
-
DSDP Site 384 (1)
-
-
Leg 9
-
DSDP Site 77 (1)
-
-
-
Europe
-
Southern Europe
-
Italy
-
Marches Italy
-
Ancona Italy
-
Massignano Italy (1)
-
-
-
-
-
Western Europe
-
United Kingdom
-
Great Britain
-
England
-
Hampshire Basin (1)
-
-
-
-
-
-
geochemistry (1)
-
Invertebrata
-
Mollusca
-
Gastropoda (1)
-
-
Protista
-
Foraminifera (3)
-
Radiolaria
-
Osculosida
-
Nassellina (1)
-
-
-
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (2)
-
O-18/O-16 (2)
-
-
-
metals
-
platinum group
-
iridium (1)
-
-
-
North America
-
Gulf Coastal Plain (2)
-
-
ocean circulation (1)
-
Ocean Drilling Program
-
Leg 114
-
ODP Site 703 (1)
-
-
Leg 143
-
ODP Site 865 (1)
-
-
Leg 150
-
ODP Site 902 (1)
-
ODP Site 903 (2)
-
ODP Site 904 (2)
-
ODP Site 906 (1)
-
-
Leg 171B
-
ODP Site 1051 (1)
-
-
Leg 174A
-
ODP Site 1073 (1)
-
-
-
oceanography (1)
-
oxygen
-
O-18/O-16 (2)
-
-
Pacific Ocean
-
East Pacific (1)
-
North Pacific
-
Mid-Pacific Mountains (1)
-
-
-
paleoclimatology (4)
-
paleoecology (2)
-
paleomagnetism (2)
-
paleontology (1)
-
palynomorphs
-
Dinoflagellata (1)
-
-
petrology (1)
-
sea-level changes (1)
-
sedimentary rocks (1)
-
sediments (1)
-
stratigraphy (1)
-
tektites (2)
-
United States
-
Alabama (1)
-
Mississippi
-
Clarke County Mississippi (1)
-
Hinds County Mississippi (1)
-
Wayne County Mississippi (1)
-
-
Texas
-
Burleson County Texas (1)
-
-
-
-
sedimentary rocks
-
sedimentary rocks (1)
-
-
sediments
-
sediments (1)
-
GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
DSDP Site 94
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.