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

Basic class information

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
3	4	GEOSCIENCES, MULTIDISCIPLINARY//GEOCHEMISTRY & GEOPHYSICS//METEOROLOGY & ATMOSPHERIC SCIENCES	1953906
0	3	GEOCHEMISTRY & GEOPHYSICS//GEOSCIENCES, MULTIDISCIPLINARY//GEOLOGY	272432
187	2	PALEONTOLOGY//GEOLOGY//AMMONITES	21050
5985	1	K T BOUNDARY//CRETACEOUS TERTIARY BOUNDARY//CRETACEOUS PALEOGENE BOUNDARY	1577

Terms with highest relevance score

rank	Category	termType	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	K T BOUNDARY	authKW	1105424	6%	60%	92
2	CRETACEOUS TERTIARY BOUNDARY	authKW	853370	4%	65%	66
3	CRETACEOUS PALEOGENE BOUNDARY	authKW	634209	3%	72%	44
4	CHICXULUB	authKW	390294	2%	78%	25
5	CHICXULUB CRATER	authKW	380638	1%	95%	20
6	K PG BOUNDARY	authKW	348137	2%	62%	28
7	CHICXULUB IMPACT	authKW	225145	1%	87%	13
8	GEOL REMOTE SENSING	address	179846	1%	75%	12
9	CHICXULUB IMPACT CRATER	authKW	122398	0%	88%	7
10	GEOCHEM COSMOCHEM ASTROCHEM	address	116442	1%	45%	13

Web of Science journal categories

chi_square_rank	Category	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	Paleontology	66718	28%	1%	439
2	Geology	45745	24%	1%	375
3	Geosciences, Multidisciplinary	13070	34%	0%	532
4	Geochemistry & Geophysics	9215	21%	0%	339
5	Geography, Physical	2560	7%	0%	111
6	Multidisciplinary Sciences	478	3%	0%	51
7	Mining & Mineral Processing	104	1%	0%	15
8	Oceanography	77	2%	0%	32
9	Mineralogy	45	1%	0%	15
10	Engineering, Petroleum	44	1%	0%	10

Address terms

chi_square_rank	term	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	GEOL REMOTE SENSING	179846	1%	75%	12
2	GEOCHEM COSMOCHEM ASTROCHEM	116442	1%	45%	13
3	PROYECTO UNIV PERFORAC OCEANOS CONTINENTES	97915	0%	70%	7
4	GEOSCI ENVIRONM TECH	83263	0%	83%	5
5	URAC 46	71367	0%	71%	5
6	UNIV INVEST CIENCIAS AMBIENTALES ARAGON	63938	1%	40%	8
7	STUDY GLOBAL CHANGE	49179	1%	31%	8
8	CIENCIAS TIERRA PALEONTOL	48725	1%	24%	10
9	LAGESE	45673	0%	57%	4
10	PALEONTOL CIENCIAS	39967	0%	100%	2

Journals

chi_square_rank	term	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass
1	GEOLOGY	37347	9%	1%	137
2	MARINE MICROPALEONTOLOGY	30290	3%	3%	47
3	CRETACEOUS RESEARCH	27644	3%	3%	54
4	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY	24327	6%	1%	98
5	INITIAL REPORTS OF THE DEEP SEA DRILLING PROJECT	20339	2%	3%	36
6	METEORITICS & PLANETARY SCIENCE	15830	3%	2%	46
7	GEOLOGIE EN MIJNBOUW	10173	1%	4%	14
8	REVIEW OF PALAEOBOTANY AND PALYNOLOGY	7801	2%	1%	34
9	MICROPALEONTOLOGY	7232	1%	2%	18
10	EARTH AND PLANETARY SCIENCE LETTERS	6574	4%	1%	66

Author Key Words

chi_square_rank	term	chi_square	shrOfCwithTerm	shrOfTermInClass	termInClass	LCSH search	Wikipedia search
1	K T BOUNDARY	1105424	6%	60%	92	Search K+T+BOUNDARY	Search K+T+BOUNDARY
2	CRETACEOUS TERTIARY BOUNDARY	853370	4%	65%	66	Search CRETACEOUS+TERTIARY+BOUNDARY	Search CRETACEOUS+TERTIARY+BOUNDARY
3	CRETACEOUS PALEOGENE BOUNDARY	634209	3%	72%	44	Search CRETACEOUS+PALEOGENE+BOUNDARY	Search CRETACEOUS+PALEOGENE+BOUNDARY
4	CHICXULUB	390294	2%	78%	25	Search CHICXULUB	Search CHICXULUB
5	CHICXULUB CRATER	380638	1%	95%	20	Search CHICXULUB+CRATER	Search CHICXULUB+CRATER
6	K PG BOUNDARY	348137	2%	62%	28	Search K+PG+BOUNDARY	Search K+PG+BOUNDARY
7	CHICXULUB IMPACT	225145	1%	87%	13	Search CHICXULUB+IMPACT	Search CHICXULUB+IMPACT
8	CHICXULUB IMPACT CRATER	122398	0%	88%	7	Search CHICXULUB+IMPACT+CRATER	Search CHICXULUB+IMPACT+CRATER
9	DANIAN	107990	1%	27%	20	Search DANIAN	Search DANIAN
10	K PG	106574	1%	67%	8	Search K+PG	Search K+PG

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.

Classes with closest relation at Level 1

rank	cluster_id2	link
1	19882	DECCAN TRAPS//INTERTRAPPEAN//DECCAN VOLCANISM
2	3558	METEORITICS & PLANETARY SCIENCE//IMPACT CRATERS//SHOCK METAMORPHISM
3	36983	INVESTIGADOR SISTEMA ACUIFERO QUINTANA ROO AC//MCEP//SIAN KAAN
4	38142	PROBE MICROANALYSIS//BANDED COMPLEX//COSMIC BOMBARDMENT
5	1371	PETM//PALEOCENE EOCENE THERMAL MAXIMUM//INITIAL REPORTS OF THE DEEP SEA DRILLING PROJECT
6	486	CRETACEOUS RESEARCH//AMMONITES//APTIAN
7	35312	NORTHEASTERN RUSSIA//PHYTOSTRATIGRAPHY//FOSSIL FLORA
8	22572	PALYNOFACIES//DINOFLAGELLATE CYSTS//SYSTEMATIC PALYNOLOGY
9	32909	FULGURITE//EXCELLENCE REMOTE SENSING EDUC//YOUNGER DRYAS IMPACT HYPOTHESIS
10	34255	AIR TRAP STRUCTURES//ALKALINE IGNEOUS ACTIVITY//BADAMI GROUP

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