Class information for:
Level 1: K T BOUNDARY//CRETACEOUS TERTIARY BOUNDARY//MAASTRICHTIAN

Basic class information
Class id #P Avg. number of
references		 Database coverage
of references
4040 1858 53.4 41%


Bar chart of Publication_year

Last years might be incomplete

Hierarchy of classes
The table includes all classes above and classes immediately below the current class.


Cluster id Level Cluster label #P
13 4 ZOOLOGY//MARINE & FRESHWATER BIOLOGY//FISHERIES 1013533
232 3       PALEONTOLOGY//JOURNAL OF PALEONTOLOGY//GEOLOGY 48747
933 2             AMMONITES//PALEONTOLOGY//CRETACEOUS RESEARCH 11019
4040 1                   K T BOUNDARY//CRETACEOUS TERTIARY BOUNDARY//MAASTRICHTIAN 1858

Terms with highest relevance score


rank Term termType Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 K T BOUNDARY authKW 948948 5% 61% 94
2 CRETACEOUS TERTIARY BOUNDARY authKW 687365 3% 64% 65
3 MAASTRICHTIAN authKW 621992 7% 30% 127
4 CRETACEOUS PALEOGENE BOUNDARY authKW 498077 2% 70% 43
5 K PG BOUNDARY authKW 306727 2% 67% 28
6 CAMPANIAN authKW 241811 3% 23% 65
7 CAMPANIAN MAASTRICHTIAN BOUNDARY authKW 205405 1% 83% 15
8 CHICXULUB authKW 191348 1% 61% 19
9 CHICXULUB IMPACT authKW 142021 1% 79% 11
10 PALEONTOLOGY WoSSC 127900 35% 1% 659

Web of Science journal categories


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 Paleontology 127900 35% 1% 659
2 Geology 68080 27% 1% 497
3 Geosciences, Multidisciplinary 16497 35% 0% 648
4 Geochemistry & Geophysics 4637 14% 0% 267
5 Geography, Physical 3414 7% 0% 138
6 Multidisciplinary Sciences 442 3% 0% 53
7 Biodiversity Conservation 117 1% 0% 27
8 Oceanography 105 2% 0% 40
9 Mining & Mineral Processing 102 1% 0% 16
10 Engineering, Petroleum 66 1% 0% 13

Address terms


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 GEOL REMOTE SENSING 117371 1% 71% 10
2 GEOCHEM COSMOCHEM ASTROCHEM 95749 1% 45% 13
3 UNITE GEOCHRONOL SEDIMENTOL OCEAN 80516 0% 70% 7
4 GEOSCI ENVIRONM TECH 68468 0% 83% 5
5 UNIV INVEST CIENCIAS AMBIENTALES ARAGON 52575 0% 40% 8
6 GEOL ECT 49286 0% 33% 9
7 CIENCIAS TIERRA PALEONTOL 48481 1% 27% 11
8 LAGESE 43818 0% 67% 4
9 URAC 46 43818 0% 67% 4
10 STUDY GLOBAL CHANGE 40439 0% 31% 8

Journals


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class
1 CRETACEOUS RESEARCH 103896 6% 6% 112
2 MARINE MICROPALEONTOLOGY 36993 3% 4% 57
3 GEOLOGY 32711 8% 1% 140
4 PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 30301 6% 2% 119
5 ACTA GEOLOGICA POLONICA 27488 1% 7% 25
6 INITIAL REPORTS OF THE DEEP SEA DRILLING PROJECT 26156 2% 4% 45
7 BULLETIN OF THE GEOLOGICAL SOCIETY OF DENMARK 22020 1% 7% 20
8 JOURNAL OF FORAMINIFERAL RESEARCH 19430 2% 4% 33
9 MICROPALEONTOLOGY 14487 2% 3% 28
10 NETHERLANDS JOURNAL OF GEOSCIENCES-GEOLOGIE EN MIJNBOUW 14272 1% 5% 17

Author Key Words


Rank Term Chi square Shr. of publ. in
class containing
term		 Class's shr. of
term's tot. occurrences		 #P with
term in
class		 LCSH search Wikipedia search
1 K T BOUNDARY 948948 5% 61% 94 Search K+T+BOUNDARY Search K+T+BOUNDARY
2 CRETACEOUS TERTIARY BOUNDARY 687365 3% 64% 65 Search CRETACEOUS+TERTIARY+BOUNDARY Search CRETACEOUS+TERTIARY+BOUNDARY
3 MAASTRICHTIAN 621992 7% 30% 127 Search MAASTRICHTIAN Search MAASTRICHTIAN
4 CRETACEOUS PALEOGENE BOUNDARY 498077 2% 70% 43 Search CRETACEOUS+PALEOGENE+BOUNDARY Search CRETACEOUS+PALEOGENE+BOUNDARY
5 K PG BOUNDARY 306727 2% 67% 28 Search K+PG+BOUNDARY Search K+PG+BOUNDARY
6 CAMPANIAN 241811 3% 23% 65 Search CAMPANIAN Search CAMPANIAN
7 CAMPANIAN MAASTRICHTIAN BOUNDARY 205405 1% 83% 15 Search CAMPANIAN+MAASTRICHTIAN+BOUNDARY Search CAMPANIAN+MAASTRICHTIAN+BOUNDARY
8 CHICXULUB 191348 1% 61% 19 Search CHICXULUB Search CHICXULUB
9 CHICXULUB IMPACT 142021 1% 79% 11 Search CHICXULUB+IMPACT Search CHICXULUB+IMPACT
10 LATE MAASTRICHTIAN 115015 1% 50% 14 Search LATE+MAASTRICHTIAN Search LATE+MAASTRICHTIAN

Core articles
The table includes core articles in the class. The following variables is taken into account for the relevance score of an article in a cluster c:
(1) Number of references referring to publications in the class.
(2) Share of total number of active references referring to publications in the class.
(3) Age of the article. New articles get higher score than old articles.
(4) Citation rate, normalized to year.


Rank Reference # ref. in
cl.		 Shr. of ref. in
cl.		 Citations
1 FASTOVSKY, DE , BERCOVICI, A , (2016) THE HELL CREEK FORMATION AND ITS CONTRIBUTION TO THE CRETACEOUS-PALEOGENE EXTINCTION: A SHORT PRIMER.CRETACEOUS RESEARCH. VOL. 57. ISSUE . P. 368 -390 82 71% 1
2 KRING, DA , (2007) THE CHICXULUB IMPACT EVENT AND ITS ENVIRONMENTAL CONSEQUENCES AT THE CRETACEOUS-TERTIARY BOUNDARY.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY. VOL. 255. ISSUE 1-2. P. 4-21 83 81% 57
3 BEIRANVAND, B , ZAGHBIB-TURKI, D , GHASEMI-NEJAD, E , (2014) INTEGRATED BIOSTRATIGRAPHY BASED ON PLANKTONIC FORAMINIFERA AND DINOFLAGELLATES ACROSS THE CRETACEOUS/PALEOGENE (K/PG) TRANSITION AT THE IZEH SECTION (SW IRAN).COMPTES RENDUS PALEVOL. VOL. 13. ISSUE 4. P. 235 -258 69 86% 0
4 GLASBY, GP , KUNZENDORF, H , (1996) MULTIPLE FACTORS IN THE ORIGIN OF THE CRETACEOUS/TERTIARY BOUNDARY: THE ROLE OF ENVIRONMENTAL STRESS AND DECCAN TRAP VOLCANISM.GEOLOGISCHE RUNDSCHAU. VOL. 85. ISSUE 2. P. 191 -210 146 62% 21
5 WITTS, JD , BOWMAN, VC , WIGNALL, PB , CRAME, JA , FRANCIS, JE , NEWTON, RJ , (2015) EVOLUTION AND EXTINCTION OF MAASTRICHTIAN (LATE CRETACEOUS) CEPHALOPODS FROM THE LOPEZ DE BERTODANO FORMATION, SEYMOUR ISLAND, ANTARCTICA.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY. VOL. 418. ISSUE . P. 193 -212 72 70% 4
6 MOLINA, E , ALEGRET, L , ARENILLAS, I , ARZ, JA , GALLALA, N , GRAJALES-NISHIMURA, JM , MURILLO-MUNETON, G , ZAGHBIB-TURKI, D , (2009) THE GLOBAL BOUNDARY STRATOTYPE SECTION AND POINT FOR THE BASE OF THE DANIAN STAGE (PALEOCENE, PALEOGENE, "TERTIARY", CENOZOIC): AUXILIARY SECTIONS AND CORRELATION.EPISODES. VOL. 32. ISSUE 2. P. 84-95 62 97% 9
7 KELLER, G , KHOZYEM, H , ADATTE, T , MALARKODI, N , SPANGENBERG, JE , STINNESBECK, W , (2013) CHICXULUB IMPACT SPHERULES IN THE NORTH ATLANTIC AND CARIBBEAN: AGE CONSTRAINTS AND CRETACEOUS-TERTIARY BOUNDARY HIATUS.GEOLOGICAL MAGAZINE. VOL. 150. ISSUE 5. P. 885 -907 55 96% 1
8 SCHULTE, P , ALEGRET, L , ARENILLAS, I , ARZ, JA , BARTON, PJ , BOWN, PR , BRALOWER, TJ , CHRISTESON, GL , CLAEYS, P , COCKELL, CS , ET AL (2010) THE CHICXULUB ASTEROID IMPACT AND MASS EXTINCTION AT THE CRETACEOUS-PALEOGENE BOUNDARY.SCIENCE. VOL. 327. ISSUE 5970. P. 1214 -1218 40 85% 264
9 KELLER, G , STINNESBECK, W , ADATTE, T , STUBEN, D , (2003) MULTIPLE IMPACTS ACROSS THE CRETACEOUS-TERTIARY BOUNDARY.EARTH-SCIENCE REVIEWS. VOL. 62. ISSUE 3-4. P. 327 -363 66 93% 62
10 GALLALA, N , (2014) BIOSTRATIGRAPHY, PALEOECOLOGY AND ACME-ZONES OF PLANKTIC FORAMINIFERA OF THE CRETACEOUS-PALEOGENE TRANSITION IN THE TETHYS (TUNISIA AND SPAIN) AND THE ATLANTIC REALM (FRANCE).ANNALES DE PALEONTOLOGIE. VOL. 100. ISSUE 3. P. 193 -215 62 79% 1

Classes with closest relation at Level 1


Rank Class id link
1 19814 DECCAN TRAPS//DECCAN VOLCANISM//INTERTRAPPEAN
2 28013 CHALK GROUP//CHALK//NANO QUARTZ
3 3316 PETM//PALEOCENE EOCENE THERMAL MAXIMUM//EOCENE
4 816 CRETACEOUS RESEARCH//AMMONITES//APTIAN
5 3164 METEORITICS & PLANETARY SCIENCE//IMPACT CRATERS//IMPACT CRATERING GRP
6 34675 ORTHOZONE//DINOCYSTS//WEST SIBERIAN PLATE
7 25894 INITIAL REPORTS OF THE DEEP SEA DRILLING PROJECT//BAS RHIN BOUXWILLER BREMMELBACH//BIOFACIES PALYNOFACIES
8 5245 PALEOBIOLOGY//MACROEVOLUTION//PALEONTOLOGY
9 12098 PLESIOSAURIA//ICHTHYOSAURIA//MOSASAURS
10 31616 EXCELLENCE REMOTE SENSING EDUC//BLACK MAT//GEOMORPHOL PEDOL

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