World's Best Scientists 2026 revealed!

D-Index & Metrics

Environmental Sciences

D-Index
55
Citations
11282
World Ranking
3850
National Ranking
294

Mark A. Sephton publication distribution in Environmental Sciences in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Environmental Sciences in 2026. The highlighted bar marks where Mark A. Sephton sits on this spectrum.

41–50 publications: 21 scientists 51–60 publications: 62 scientists 61–70 publications: 133 scientists 71–80 publications: 257 scientists 81–90 publications: 361 scientists 91–100 publications: 440 scientists 101–110 publications: 492 scientists 111–120 publications: 541 scientists 121–130 publications: 617 scientists 131–140 publications: 544 scientists 141–150 publications: 541 scientists 151–160 publications: 539 scientists 161–170 publications: 444 scientists 171–180 publications: 444 scientists 181–190 publications: 400 scientists 191–200 publications: 377 scientists 201–210 publications: 318 scientists 211–220 publications: 282 scientists 221–230 publications: 263 scientists 231–240 publications: 220 scientists 241–250 publications: 217 scientists 251–260 publications: 180 scientists 261–270 publications: 181 scientists 271–280 publications: 155 scientists 281–290 publications: 130 scientists 291–300 publications: 127 scientists 301–310 publications: 130 scientists 311–320 publications: 85 scientists 321–330 publications: 106 scientists 331–340 publications: 80 scientists 341–350 publications: 83 scientists 351–360 publications: 75 scientists 361–370 publications: 69 scientists 371–380 publications: 52 scientists 381–390 publications: 54 scientists 391–400 publications: 56 scientists 401–410 publications: 44 scientists 411–420 publications: 40 scientists 421–430 publications: 36 scientists 431–440 publications: 25 scientists 441–450 publications: 25 scientists 451–460 publications: 32 scientists 461–470 publications: 29 scientists 471–480 publications: 21 scientists 481–490 publications: 26 scientists 491–500 publications: 26 scientists 501–510 publications: 17 scientists 511–520 publications: 19 scientists 521–530 publications: 15 scientists 531–540 publications: 22 scientists 541–550 publications: 12 scientists 551–560 publications: 15 scientists 561–570 publications: 11 scientists 571–580 publications: 19 scientists 581–590 publications: 9 scientists 591–600 publications: 9 scientists 601–610 publications: 7 scientists 611–620 publications: 11 scientists 621–630 publications: 5 scientists 631–640 publications: 5 scientists 641–650 publications: 6 scientists 651–660 publications: 3 scientists 661–670 publications: 3 scientists 671–680 publications: 4 scientists 681–689 publications: 4 scientists 690+ publications: 100 scientists
41 publications 690+

This scientist: 357 publications — 91st percentile

91% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 690 publications or more.

Mark A. Sephton D-index placement in Environmental Sciences in 2026

The chart shows the D-index (discipline H-index) distribution of Environmental Sciences scientists ranked by Research.com in 2026. The highlighted bar marks where Mark A. Sephton sits on this spectrum.

30 D-Index: 12 scientists 31 D-Index: 26 scientists 32 D-Index: 51 scientists 33 D-Index: 88 scientists 34 D-Index: 123 scientists 35 D-Index: 163 scientists 36 D-Index: 206 scientists 37 D-Index: 267 scientists 38 D-Index: 265 scientists 39 D-Index: 275 scientists 40 D-Index: 321 scientists 41 D-Index: 343 scientists 42 D-Index: 305 scientists 43 D-Index: 336 scientists 44 D-Index: 330 scientists 45 D-Index: 348 scientists 46 D-Index: 291 scientists 47 D-Index: 275 scientists 48 D-Index: 272 scientists 49 D-Index: 273 scientists 50 D-Index: 263 scientists 51 D-Index: 232 scientists 52 D-Index: 266 scientists 53 D-Index: 217 scientists 54 D-Index: 198 scientists 55 D-Index: 177 scientists 56 D-Index: 202 scientists 57 D-Index: 204 scientists 58 D-Index: 166 scientists 59 D-Index: 177 scientists 60 D-Index: 166 scientists 61 D-Index: 152 scientists 62 D-Index: 143 scientists 63 D-Index: 150 scientists 64 D-Index: 124 scientists 65 D-Index: 119 scientists 66 D-Index: 120 scientists 67 D-Index: 118 scientists 68 D-Index: 82 scientists 69 D-Index: 98 scientists 70 D-Index: 94 scientists 71 D-Index: 105 scientists 72 D-Index: 74 scientists 73 D-Index: 84 scientists 74 D-Index: 70 scientists 75 D-Index: 67 scientists 76 D-Index: 78 scientists 77 D-Index: 60 scientists 78 D-Index: 59 scientists 79 D-Index: 52 scientists 80 D-Index: 47 scientists 81 D-Index: 38 scientists 82 D-Index: 48 scientists 83 D-Index: 42 scientists 84 D-Index: 42 scientists 85 D-Index: 43 scientists 86 D-Index: 29 scientists 87 D-Index: 37 scientists 88 D-Index: 29 scientists 89 D-Index: 30 scientists 90 D-Index: 34 scientists 91 D-Index: 20 scientists 92 D-Index: 22 scientists 93 D-Index: 17 scientists 94 D-Index: 19 scientists 95 D-Index: 24 scientists 96 D-Index: 21 scientists 97 D-Index: 20 scientists 98 D-Index: 24 scientists 99 D-Index: 17 scientists 100 D-Index: 17 scientists 101 D-Index: 21 scientists 102 D-Index: 25 scientists 103 D-Index: 18 scientists 104 D-Index: 26 scientists 105 D-Index: 20 scientists 106 D-Index: 15 scientists 107 D-Index: 10 scientists 108 D-Index: 13 scientists 109 D-Index: 15 scientists 110 D-Index: 12 scientists 111 D-Index: 8 scientists 112 D-Index: 7 scientists 113 D-Index: 9 scientists 114 D-Index: 6 scientists 115 D-Index: 12 scientists 116 D-Index: 7 scientists 117 D-Index: 8 scientists 118 D-Index: 3 scientists 119 D-Index: 5 scientists 120 D-Index: 7 scientists 121 D-Index: 2 scientists 122 D-Index: 4 scientists 123 D-Index: 8 scientists 124 D-Index: 7 scientists 125 D-Index: 9 scientists 126+ D-Index: 92 scientists
30 D-Index 126+

This scientist: 55 D-Index — 61st percentile

61% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 126 D-Index or more.

Overview

Mark A. Sephton is affiliated with Imperial College London in the United Kingdom. Their research primarily focuses on the fields of Physics and Astronomy, with particular specialization in subfields such as Astronomy and Astrophysics, Ecology, Mechanics of Materials, Aerospace Engineering, and Biomedical Engineering.

The scientist's work covers several main topics related to planetary and space sciences, including:

  • Planetary Science and Exploration
  • Astro and Planetary Science
  • Isotope Analysis in Ecology
  • Hydrocarbon exploration and reservoir analysis
  • Space Science and Extraterrestrial Life
  • Space Exploration and Technology
  • Paleontology and Stratigraphy of Fossils

Mark A. Sephton has been published extensively in various scientific venues. Frequent publication outlets include:

  • Astrobiology
  • Journal of Geophysical Research Planets
  • Zenodo (CERN European Organization for Nuclear Research)
  • Science
  • Science Advances

Among their recent papers are several contributions focused on planetary geology, geochemistry, and exploration missions:

  • Aqueous alteration processes in Jezero crater, Mars-implications for organic geochemistry, 2022, Science
  • Samples Collected From the Floor of Jezero Crater With the Mars 2020 Perseverance Rover, 2023, Journal of Geophysical Research Planets
  • The Winchcombe meteorite, a unique and pristine witness from the outer solar system, 2022, Science Advances
  • Investigating Europa's Habitability with the Europa Clipper, 2023, Space Science Reviews
  • Evidence of Sulfate-Rich Fluid Alteration in Jezero Crater Floor, Mars, 2024, Journal of Geophysical Research Planets

The scientist collaborates frequently with other researchers. Common coauthors include:

  • Jonathan S. Watson
  • Sandra Siljeström
  • Kathleen C. Benison
  • A. J. Brown
  • A. Steele

Best Publications

  • Organic compounds in carbonaceous meteorites

    Mark A. Sephton

  • Lunar and Planetary Science Conference

    R. Quinn;A. Elsaesser;P. Ehrenfreund;A. Ricco

  • Extraterrestrial nucleobases in the Murchison meteorite

    Zita Martins;Oliver Botta;Oliver Botta;Marilyn L. Fogel;Mark A. Sephton

  • Catastrophic soil erosion during the end-Permian biotic crisis

    Mark A. Sephton;Cindy V. Looy;Henk Brinkhuis;Paul B. Wignall

  • Environmental mutagenesis during the end-Permian ecological crisis

    Henk Visscher;Cindy V. Looy;Margaret E. Collinson;Henk Brinkhuis

  • Transitory microbial habitat in the hyperarid Atacama Desert

    Dirk Schulze-Makuch;Dirk Schulze-Makuch;Dirk Wagner;Samuel P Kounaves;Samuel P Kounaves;Kai Mangelsdorf

  • Aqueously altered igneous rocks sampled on the floor of Jezero crater, Mars

    Unknown

  • Weathering of Chondritic Meteorites

    P. A. Bland;M. E. Zolensky;G. K. Benedix;M. A. Sephton

  • Carbon and nitrogen in carbonaceous chondrites: Elemental abundances and stable isotopic compositions

    V. K. Pearson;M. A. Sephton;I. A. Franchi;J. M. Gibson

  • Searching for life on Mars: selection of molecular targets for ESA's aurora ExoMars mission

    John Parnell;David Cullen;Mark R. Sims;Stephen Alan Bowden

  • Shock synthesis of amino acids from impacting cometary and icy planet surface analogues

    Zita Martins;Mark C. Price;Nir Goldman;Mark A. Sephton

  • Aqueous alteration processes in Jezero crater, Mars−implications for organic geochemistry

    Unknown

  • Defining biominerals and organominerals: direct and indirect indicators of life

    Randall S. Perry;Randall S. Perry;Nicola Mcloughlin;Bridget Y. Lynne;Mark A. Sephton

  • Investigating the variations in carbon and nitrogen isotopes in carbonaceous chondrites

    M.A. Sephton;A.B. Verchovsky;P.A. Bland;I. Gilmour

  • Clay mineral‐organic matter relationships in the early solar system

    Victoria K. Pearson;Mark A. Sephton;Anton T. Kearsley;Philip A. Bland

  • δ13C of free and macromolecular aromatic structures in the murchison meteorite

    M.A. Sephton;C.T. Pillinger;I. Gilmour

  • Aromatic moieties in meteoritic macromolecular materials: analyses by hydrous pyrolysis and δ13C of individual compounds

    M.A Sephton;C.T Pillinger;I Gilmour

  • Carbon molecules in space: from astrochemistry to astrobiology

    Pascale Ehrenfreund;Mark A. Sephton

  • Hydropyrolysis of insoluble carbonaceous matter in the Murchison meteorite: New insights into its macromolecular structure

    M.A Sephton;G.D Love;J.S Watson;A.B Verchovsky

  • On the Origins of Deep Hydrocarbons

    Mark A. Sephton;Robert M. Hazen

  • The end Triassic mass extinction record of Williston Lake, British Columbia

    P.B. Wignall;J.-P. Zonneveld;R.J. Newton;K. Amor

  • Baking black opal in the desert sun: The importance of silica in desert varnish

    Randall S. Perry;Bridget Y. Lynne;Mark A. Sephton;Vera M. Kolb

  • Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event

    Mark A. Sephton;Ken Amor;Ian A. Franchi;Paul B. Wignall

  • Geochemistry of the end-Permian extinction event in Austria and Italy: No evidence for an extraterrestrial component

    Christian Koeberl;Kenneth A. Farley;Bernhard Peucker-Ehrenbrink;Mark A. Sephton

  • Adsorption of l-lysine on montmorillonite

    Anita Parbhakar;Javier Cuadros;Mark A. Sephton;William Dubbin

Frequent Co-Authors

Scott M. McLennan
Scott M. McLennan Stony Brook University
Christopher D. K. Herd
Christopher D. K. Herd University of Alberta
Harry Y. McSween
Harry Y. McSween University of Tennessee at Knoxville
Monica M. Grady
Monica M. Grady The Open University
Munir Humayun
Munir Humayun Florida State University
Jack D. Farmer
Jack D. Farmer Arizona State University
Kathleen A. Campbell
Kathleen A. Campbell University of Auckland
Andrew Steele
Andrew Steele Carnegie Institution for Science
Mahesh Anand
Mahesh Anand The Open University

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