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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Egypt (1)
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Tunisia
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El Kef Tunisia (20)
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Asia
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Middle East
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Israel (1)
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Atlantic Ocean
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North Atlantic
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Atlantic region (1)
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Europe
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Southern Europe
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Iberian Peninsula
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Spain
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Basque Provinces Spain (1)
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Betic Cordillera (1)
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Cantabrian Basin (1)
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Murcia Spain
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Caravaca Spain (1)
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Italy
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Marches Italy (1)
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Umbria Italy
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Perugia Italy
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Gubbio Italy (2)
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Western Europe
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France
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Pyrenees-Atlantiques France
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Biarritz France (1)
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Scandinavia
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Denmark
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Indian Ocean
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Kerguelen Plateau (1)
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Southern Ocean
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Weddell Sea
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United States
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Alabama (1)
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New Jersey (1)
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Texas
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Brazos River (2)
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elements, isotopes
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carbon
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C-13/C-12 (3)
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organic carbon (1)
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chemical ratios (1)
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isotope ratios (3)
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isotopes
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stable isotopes
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C-13/C-12 (3)
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O-18/O-16 (3)
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Sr-87/Sr-86 (2)
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metals
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alkaline earth metals
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calcium (1)
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strontium
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Sr-87/Sr-86 (2)
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nickel (1)
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platinum group
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iridium (2)
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rare earths (1)
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oxygen
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O-18/O-16 (3)
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fossils
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Chordata
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Vertebrata (1)
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Invertebrata
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Mollusca
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Cephalopoda
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Ammonoidea (1)
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Protista
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Foraminifera
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Rotaliina
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Cassidulinacea
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Anomalinidae (1)
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Globigerinacea
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Globigerinidae
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Globigerina (1)
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Hedbergella (1)
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Heterohelicidae (1)
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microfossils (17)
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palynomorphs
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Plantae
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algae
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nannofossils (1)
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thallophytes (1)
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geochronology methods
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lower Paleocene
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Danian (5)
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K-T boundary (10)
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Mesozoic
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Cretaceous
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Upper Cretaceous
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Campanian (2)
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K-T boundary (10)
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lower Maestrichtian (1)
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upper Maestrichtian (3)
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minerals
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oxides
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clay minerals
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kaolinite (1)
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smectite (1)
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illite (1)
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Primary terms
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Africa
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North Africa
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Egypt (1)
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Tunisia
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El Kef Tunisia (20)
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Asia
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Middle East
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Israel (1)
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Atlantic Ocean
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North Atlantic
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Gulf of Mexico (1)
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Atlantic region (1)
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biogeography (1)
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carbon
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C-13/C-12 (3)
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organic carbon (1)
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Cenozoic
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Tertiary
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lower Tertiary (1)
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Paleogene
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lower Paleogene (1)
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Paleocene
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lower Paleocene
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Danian (5)
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K-T boundary (10)
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Chordata
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Vertebrata (1)
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clay mineralogy (2)
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climate change (1)
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Deep Sea Drilling Project
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IPOD
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Leg 72 (1)
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Leg 80
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DSDP Site 548 (1)
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Leg 93
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DSDP Site 605 (1)
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Leg 10
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DSDP Site 95 (1)
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Leg 12
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DSDP Site 111 (1)
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Leg 2
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DSDP Site 10 (1)
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Leg 3
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DSDP Site 21 (1)
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Leg 39
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DSDP Site 356 (1)
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DSDP Site 357 (1)
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Leg 43
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DSDP Site 384 (1)
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Leg 44
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DSDP Site 390 (1)
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diagenesis (2)
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Europe
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Southern Europe
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Iberian Peninsula
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Spain
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Basque Provinces Spain (1)
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Murcia Spain
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Caravaca Spain (1)
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Italy
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Marches Italy (1)
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Umbria Italy
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Gubbio Italy (2)
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Western Europe
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France
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Pyrenees-Atlantiques France
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Biarritz France (1)
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Scandinavia
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Denmark
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Stevns Klint (1)
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folds (1)
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geochemistry (5)
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Indian Ocean
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Exmouth Plateau (1)
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Naturaliste Plateau (1)
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Invertebrata
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Mollusca
-
Cephalopoda
-
Ammonoidea (1)
-
-
-
Protista
-
Foraminifera
-
Rotaliina
-
Cassidulinacea
-
Anomalinidae (1)
-
-
Globigerinacea
-
Globigerinidae
-
Globigerina (1)
-
-
Hedbergella (1)
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Heterohelicidae (1)
-
-
-
-
-
-
isotopes
-
stable isotopes
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C-13/C-12 (3)
-
O-18/O-16 (3)
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Sr-87/Sr-86 (2)
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-
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Mediterranean region (1)
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Mesozoic
-
Cretaceous
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Upper Cretaceous
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Campanian (2)
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Coniacian (1)
-
K-T boundary (10)
-
Maestrichtian
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lower Maestrichtian (1)
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upper Maestrichtian (3)
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Santonian (1)
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Senonian (6)
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Turonian (1)
-
-
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Triassic (1)
-
-
metals
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alkaline earth metals
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calcium (1)
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strontium
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Sr-87/Sr-86 (2)
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nickel (1)
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platinum group
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iridium (2)
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rare earths (1)
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-
Ocean Drilling Program (2)
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oxygen
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O-18/O-16 (3)
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paleoclimatology (4)
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paleoecology (5)
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paleogeography (4)
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paleomagnetism (1)
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paleontology (2)
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palynomorphs
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Dinoflagellata (1)
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Plantae
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algae
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nannofossils (1)
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sea-level changes (1)
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sedimentary petrology (1)
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sedimentary rocks
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carbonate rocks
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chalk (1)
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limestone (1)
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clastic rocks
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marl (1)
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Southern Ocean
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Weddell Sea
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Maud Rise (1)
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stratigraphy (2)
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tectonics (1)
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thallophytes (1)
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United States
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Alabama (1)
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New Jersey (1)
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Texas
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Brazos River (2)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks
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chalk (1)
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limestone (1)
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clastic rocks
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marl (1)
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El Kef Tunisia
MORPHOSTATISTICAL ANALYSIS OF MAASTRICHTIAN POPULATIONS OF GUEMBELITRIA FROM EL KEF, TUNISIA
An independent test of planktic foraminiferal turnover across the Cretaceous/Paleogene (K/P) boundary at El Kef, Tunisia; catastrophic mass extinction and possible survivorship
Ni-rich spinel at the Cretaceous-Tertiary boundary of El Kef, Tunisia
Records of post–Cretaceous-Tertiary boundary millennial-scale cooling from the western Tethys: A smoking gun for the impact-winter hypothesis?
L'iridium a la limite Cretace-Tertiaire du site d'El Kef, Tunisie
High-resolution late Maastrichtian–early Danian oceanic 87 Sr/ 86 Sr record: Implications for Cretaceous-Tertiary boundary events
Calcareous nannofossils at the K-T boundary, El Kef: No evidence for stepwise, gradual, or sequential extinctions
Planktonic foraminifera show 30 to 45 percent of the species disappearing during the 300,000 to 400,000 years prior to the Cretaceous/Tertiary (K/T) boundary in continental shelf (El Kef, Tunisia) and epicontinental sea (Brazos River, Texas) sections. Their disappearance appears to be linked to a sea-level regression and global cooling. At the K/T boundary a 26 percent species reduction coincides with the geochemical anomalies at El Kef; their disappearance appears to be a direct consequence of the K/T boundary event. No change is observed at Brazos River. At both El Kef and Brazos River, many species (11 and 33 percent, respectively) disappear shortly after the K/T boundary, and all but one of the Cretaceous survivors terminally decline in relative abundance beginning at the K/T boundary. This pattern of species extinctions clearly shows a significant decline in species diversity during the latest Maastrichtian, followed by a sudden decline in diversity at the K/T boundary, which drastically and permanently altered planktonic foraminiferal communities. The K/T boundary event, however, did not cause instantaneous extinctions of nearly all species, as commonly claimed. Initial recovery of the ecosystem appears to have occurred about 230,000 years after the K/T boundary event, as implied by an increase in carbonate sedimentation, carbon isotope values, and diversification of planktonic foraminifera. Carbon and oxygen isotope records of benthic and planktonic foraminifera at Brazos River reveal remarkable new data with far-reaching implications. For instance, the δ 13 C shift, which characterizes the K/T boundary globally, coincides with the micropaleontologically defined boundary and not with the tsunami deposit of Bourgeois and others (1988), indicating that the latter deposit is independent of the boundary event. Moreover, the δ 13 C shift occurs gradually over thousands of years, and not instantaneously as recorded in deep-sea sections, implying a more gradual and long-term effect than commonly assumed. Furthermore, stable isotopic data unequivocally show the survivorship of many Cretaceous species well into the early Tertiary.