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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 47 3961 3633 1550 1374 180 9584

R. Paul Philp publications per year

The chart shows the history of publications by R. Paul Philp between 1976 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. R. Paul Philp published across 50 years, from 1976 to 2025, averaging 4.1 papers a year. Output peaked at 10 publications in 1985. 3 of the 206 publications appeared in the last two years.

No. of publications
2 4 6 8 10
Bar chart. Horizontal axis: year, 1976 to 2025. Vertical axis: number of publications, 0 to 10. Peak 10 publications in 1985. 1976: 1 publication 1977: 1 publication 1978: 1 publication 1979: 0 publications 1980: 6 publications 1981: 2 publications 1982: 8 publications 1983: 5 publications 1984: 5 publications 1985: 10 publications 1986: 3 publications 1987: 6 publications 1988: 9 publications 1989: 10 publications 1990: 9 publications 1991: 7 publications 1992: 7 publications 1993: 6 publications 1994: 10 publications 1995: 8 publications 1996: 4 publications 1997: 5 publications 1998: 4 publications 1999: 2 publications 2000: 5 publications 2001: 2 publications 2002: 5 publications 2003: 6 publications 2004: 0 publications 2005: 3 publications 2006: 1 publication 2007: 4 publications 2008: 2 publications 2009: 3 publications 2010: 4 publications 2011: 1 publication 2012: 5 publications 2013: 1 publication 2014: 2 publications 2015: 4 publications 2016: 3 publications 2017: 2 publications 2018: 7 publications 2019: 6 publications 2020: 4 publications 2021: 1 publication 2022: 0 publications 2023: 3 publications 2024: 2 publications 2025: 1 publication
1976 2025

206 publications in total across all disciplines

View publications per year as a table
R. Paul Philp: publications per year, 1976 to 2025
Year Publications
1976 1
1977 1
1978 1
1979 0
1980 6
1981 2
1982 8
1983 5
1984 5
1985 10
1986 3
1987 6
1988 9
1989 10
1990 9
1991 7
1992 7
1993 6
1994 10
1995 8
1996 4
1997 5
1998 4
1999 2
2000 5
2001 2
2002 5
2003 6
2004 0
2005 3
2006 1
2007 4
2008 2
2009 3
2010 4
2011 1
2012 5
2013 1
2014 2
2015 4
2016 3
2017 2
2018 7
2019 6
2020 4
2021 1
2022 0
2023 3
2024 2
2025 1
Total 206
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R. Paul Philp publications per year - data summary

  • R. Paul Philp, a Earth Science scholar from University of Oklahoma, has 206 publications recorded across 50 years, from 1976 to 2025.
  • The oldest publication on record dates to 1976 and the most recent to 2025.
  • The most productive years are 1985, 1989 and 1994, with 10 publications each.
  • The least productive years with any output are 1976, 1977, 1978, 2006 and others, with 1 publication each.
  • 3 of the 50 years in the span carry no publications at all (1979, 2004 and 2022).
  • The rate of publication averages 4.1 papers per year over the whole span, or 4.4 per year counting only the 47 years with at least one publication.
  • The last 5 years on the chart (2021-2025) hold 7 publications, 3% of the career total.
  • Split into equal eras - 1976-1992: 90 publications (5.3 per year); 1993-2009: 70 publications (4.1 per year); 2010-2025: 46 publications (2.9 per year).
  • Comparing the opening and closing eras, the overall trend of publication is declining.

R. Paul Philp publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where R. Paul Philp sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 178–187 publications, is where this scientist sits. 38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38–47 publications 603+

This scientist: 180 publications — 54th percentile

54% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414 180
188–197 401
198–207 333
208–217 292
218–227 290
228–237 262
238–247 243
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
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R. Paul Philp publication distribution in Earth Science in 2026 - data summary

  • The chart plots the publication count of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 58 ranges running from 38–47 to 603+ publications.
  • R. Paul Philp, a Earth Science scholar from University of Oklahoma, records 180 publications - the 54th percentile of the discipline.
  • 54% of ranked Earth Science scientists score the same or lower than R. Paul Philp, and about 46% score higher.
  • The median of the discipline falls in the 168–177 publications range, and R. Paul Philp ranks above the median.
  • The most crowded range is 128–137 publications, holding 557 scientists (6% of the field).
  • 58% of the field sits in the lowest quarter of the value range (up to 178–187 publications), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 603 publications or more, 100 scientists in all (1% of the field).

R. Paul Philp D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where R. Paul Philp sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 47 D-Index, is where this scientist sits. 30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 47 D-Index — 57th percentile

57% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277
43 279
44 248
45 257
46 212
47 202 47
48 207
49 204
50 183
51 178
52 182
53 178
54 163
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
Download as CSV

R. Paul Philp D-index placement in Earth Science in 2026 - data summary

  • The chart plots the discipline H-index (D-index) of all 9,176 Earth Science scientists ranked by Research.com in 2026, grouped into 77 ranges running from 30 to 106+ D-Index.
  • R. Paul Philp, a Earth Science scholar from University of Oklahoma, records 47 D-Index - the 57th percentile of the discipline.
  • 57% of ranked Earth Science scientists score the same or lower than R. Paul Philp, and about 43% score higher.
  • The median of the discipline falls in the 44 D-Index range, and R. Paul Philp ranks above the median.
  • The most crowded range is 36 D-Index, holding 389 scientists (4% of the field).
  • 62% of the field sits in the lowest quarter of the value range (up to 49 D-Index), so the distribution is heavily right-skewed and high scores are rare.
  • The final bar has no upper bound: it groups every scientist with 106 D-Index or more, 98 scientists in all (1% of the field).

Overview

R. Paul Philp is affiliated with the University of Oklahoma in the United States. Their research spans the fields of Engineering and Environmental Science, with significant contributions to Mechanics of Materials, Analytical Chemistry, Ecology, Global and Planetary Change, and Paleontology. The major focus of their work revolves around hydrocarbon exploration and reservoir analysis, petroleum processing and analysis, coral and marine ecosystems studies, coastal wetland ecosystem dynamics, oil spill detection and mitigation, amphibian and reptile biology, as well as paleontology and evolutionary biology.

Philp has published research in several peer-reviewed journals, often collaborating with various scientists. Frequent co-authors include Marina Reback Garcia, César C. Martins, Ethan D. Mooney, Tea Maho, and Joseph J. Bevitt.

Their recent peer-reviewed papers include:

  • Biogenic and thermogenic terpenoid hydrocarbons as potential geochemical tools for the study of sedimentary organic matter in subtropical mangrove swamps (2020, Applied Geochemistry)
  • Paleozoic cave system preserves oldest-known evidence of amniote skin (2024, Current Biology)
  • Organic geochemical characterization of crude oils and source rocks from Concession 6, central Sirt Basin, Libya (2020, Arabian Journal of Geosciences)
  • Characteristics of oils and their potential source rocks from the Cherokee Platform, Oklahoma (2023, Marine and Petroleum Geology)
  • Utilization of Pyrrolic Compounds as Indicators of Secondary Migration for Woodford Oils in the Anadarko Basin, Oklahoma, USA (2024, Journal of Earth Science)

The scientific venues where Philp's work is frequently published include:

  • Applied Geochemistry
  • Current Biology
  • Journal of Earth Science
  • Arabian Journal of Geosciences
  • Marine and Petroleum Geology

Philp's research addresses multiple key topics such as hydrocarbon exploration and reservoir analysis, petroleum processing and analysis, and coastal wetland ecosystem dynamics. Their work on petroleum-related subjects also intersects with geochemical tools and source rock analysis, reflecting a detailed focus on both natural and anthropogenic organic geochemistry.

The intersection of paleontology with geological and environmental sciences is visible through publications addressing ancient biological evidence and evolutionary biology, indicating a multidisciplinary approach. By combining analytical chemistry techniques with ecological and materials sciences, Philp's research offers insights into both modern and ancient environmental and geological processes.

Best Publications

  • Petroleum Formation and Occurrence

    Unknown

  • Biomarker distributions in Australian oils predominantly derived from terrigenous source material

    Unknown

  • Pyrolysis-high resolution gas chromatography and pyrolysis gas chromatography-mass spectrometry of kerogens and kerogen precursors

    Dik van de Meent;Stephen C. Brown;R.Paul Philp;Bernd R.T. Simoneit

  • Biological markers in fossil fuel production

    R. Paul Philp

  • Geochemical Characterization of Evaporite and Carbonate Depositional Environments and Correlation of Associated Crude Oils in the Black Creek Basin, Alberta

    Unknown

  • Geochemical characterization of gases from the Mississippian Barnett Shale, Fort Worth Basin, Texas

    Norelis D. Rodriguez;R. Paul Philp

  • Organic geochemistry of the Woodford Shale, southeastern Oklahoma: How variable can shales be?

    Andrea Miceli Romero;R. Paul Philp

  • Source Identification of Oil Spills Based on the Isotopic Composition of Individual Components in Weathered Oil Samples

    Laurence Mansuy;R. Paul Philp;Jon Allen

  • New insights on the Green River petroleum system in the Uinta basin from hydrous pyrolysis experiments

    Tim E. Ruble;M. D. Lewan;R. P. Philp

  • Geochemical application of sterane and triterpane biomarkers to a description of oils from the Taranaki Basin in New Zealand

    Unknown

  • The emergence of stable isotopes in environmental and forensic geochemistry studies: a review

    R. Paul Philp

  • Possible origin for insoluble organic (kerogen) debris in sediments from insoluble cell-wall materials of algae and bacteria

    R. P. Philp;M. Calvin

  • Stable carbon isotopic composition of gasolines determined by isotope ratio monitoring gas chromatography mass spectrometry

    Barbara J. Smallwood;R. Paul Philp;Jon D. Allen

  • Bicyclic sesquiterpenoids and diterpenoids in Australian crude oils

    Unknown

  • Waxes and asphaltenes in crude oils

    Unknown

  • Distinguishing Abiotic and Biotic Transformation of Tetrachloroethylene and Trichloroethylene by Stable Carbon Isotope Fractionation

    Xiaoming Liang;Yiran Dong;Tomasz Kuder;Lee R. Krumholz

  • Early developments in petroleum geochemistry

    John M. Hunt;R.Paul Philp;Keith A. Kvenvolden

  • Sesquiterpanes, diterpanes and other higher terpanes in oils from the Taranaki basin of New Zealand

    Roderick J. Weston;R.Paul Philp;Carolyn M. Sheppard;Anthony D. Woolhouse

  • Biodegradation of low‐molecular‐weight alkanes under mesophilic, sulfate‐reducing conditions: metabolic intermediates and community patterns

    Kristen N. Savage;Kristen N. Savage;Lee R. Krumholz;Lisa M. Gieg;Victoria A. Parisi

  • Long-chain alkenones in Qinghai Lake sediments

    Unknown

  • The distribution and quantitation of organonitrogen compounds in crude oils and rock pyrolysates

    Allen J. Bakel;R.Paul Philp

  • Geochemical and isotopic approach to maturity/source/mixing estimations for natural gas and associated condensates in the Thrace Basin, NW Turkey

    Kadir Gürgey;R. Paul Philp;Chris Clayton;Hasan Emiroğlu

  • Kinetic and isotope analyses of tetrachloroethylene and trichloroethylene degradation by model Fe(II)-bearing minerals.

    Xiaoming Liang;R. Paul Philp;Elizabeth C. Butler

  • The Use of Stable Isotopes to Differentiate Specific Source Markers for MTBE

    Barbara J. Smallwood;R.Paul Philp;Thomas W. Burgoyne;Jon D. Allen

  • Compound specific isotopic variability in Uinta Basin native bitumens: paleoenvironmental implications

    Tim E. Ruble;Allen J. Bakel;R. Paul Philp

  • High temperature gas chromatography for the analysis of fossil fuels: A review

    R. Paul Philp

  • Polycyclic alkanes in a biodegraded oil from the Kelamayi oilfield, northwestern China

    Jiang Zhusheng;M.G. Fowler;C.A. Lewis;R.P. Philp

  • Characterization of high molecular weight biomarkers in crude oils

    Michael Hsieh;R.Paul Philp;J.C del Rio

  • Field ionization mass spectrometric study of high molecular weight hydrocarbons in a crude oil and a solid bitumen

    José C del Rı́o;R.Paul Philp

  • The Use of the Isotopic Composition of Individual Compounds for Correlating Spilled Oils and Refined Products in the Environment with Suspected Sources

    R. Paul Philp;Jon Allen;Tomasz Kuder

Frequent Co-Authors

Lee R. Krumholz
Lee R. Krumholz University of Oklahoma
Mostafa S. Elshahed
Mostafa S. Elshahed Oklahoma State University
Joseph M. Suflita
Joseph M. Suflita University of Oklahoma
Aaron D. Peacock
Aaron D. Peacock Microbac Laboratories
Christopher E. Aston
Christopher E. Aston University of Oklahoma Health Sciences Center
Keith A. Kvenvolden
Keith A. Kvenvolden United States Geological Survey
James R. Maxwell
James R. Maxwell University of Bristol
José C. del Río
José C. del Río Spanish National Research Council

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