Mark A. Sephton

10.7k citations

242 papers · 6.6k · 2 hit papers · h-index 40

Impact in

Astronomy and Astrophysics top 0.5%
- Astro and Planetary Science
- Planetary Science and Exploration
- Origins and Evolution of Life
Paleontology top 0.5%
- Paleontology and Stratigraphy of Fossils

Papers in

Astronomy and Astrophysics 158
- Astro and Planetary Science 131
- Planetary Science and Exploration 97
- Space Science and Extraterrestrial Life 21
Ecology 86
- Isotope Analysis in Ecology 80

Co-authors: I. Gilmour (40 shared papers)Jonathan S. Watson (50 shared papers)Zita Martins (23 shared papers)Richard W. Court (26 shared papers)P. Ehrenfreund (14 shared papers)Cindy V. Looy (7 shared papers)Henk Visscher (6 shared papers)C. T. Pillinger (7 shared papers)
Journals: Astrobiology (27 papers)Planetary and Space Science (17 papers)Meteoritics and Planetary Science (13 papers)Geochimica et Cosmochimica Acta (12 papers)International Journal of Astrobiology (10 papers)
Partner nations: United Kingdom United States Netherlands

In The Last Decade

Mark A. Sephton

232 papers receiving 6.5k citations

Mark A. Sephton's Hit Papers

align trajectories log scale

Lunar and Planetary Science Conference 2013 · 479 citations

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if any of the following hold:

it has ≥500 total citations;
it reaches ≥1.5× the top-1% citation threshold for papers in the same subfield and year (the threshold is the minimum needed to enter the top 1%, not the average within it);
it reaches the top citation threshold in at least one of its specific research topics.

2013 Lunar and Planetary Science Conference
2002 Natural Product Reports

Peers

Countries citing papers authored by Mark A. Sephton

Since Specialization

Citations

This map shows the geographic impact of Mark A. Sephton's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Mark A. Sephton with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Mark A. Sephton more than expected).

Fields of papers citing papers by Mark A. Sephton

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Mark A. Sephton. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Mark A. Sephton. The network helps show where Mark A. Sephton may publish in the future.

Co-authors

The 25 scholars most cited alongside Mark A. Sephton, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Mark A. Sephton Line = papers co-authored together Mark A. Sephton links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

Showing the 20 most-cited of 242 papers — load more, or switch the sort, to bring in the rest.

#	Work
1	Organic compounds in carbonaceous meteorites Natural Product Reports ·Mark A. Sephton Hit paper breakdown →	2002	516
2	Lunar and Planetary Science Conference R. C. Quinn, Andreas Elsaesser, P. Ehrenfreund, Antonio J. Ricco, A. Breitenbach, Jonathan Chan, A. Fresneau, Jason Alonzo, A. L. Mattioda, Farid Salama, O. Santos, Ella Sciamma-O’Brien, Hervé Cottin, E. Dartois, Louis Le Sergeant d’Hendecourt, René Demets, Bernard Foing, Zita Martins, Mark A. Sephton, M. Spaans Hit paper breakdown →	2013	479
3	Extraterrestrial nucleobases in the Murchison meteorite Earth and Planetary Science Letters ·Zita Martins, Oliver Botta, Marilyn L. Fogel, Mark A. Sephton, D. P. Glavin, Jonathan S. Watson, Jason P. Dworkin, Alan W. Schwartz, P. Ehrenfreund	2008	261
4	Catastrophic soil erosion during the end-Permian biotic crisis Geology ·Mark A. Sephton, Cindy V. Looy, Henk Brinkhuis, Paul B. Wignall, J.W. de Leeuw, Henk Visscher	2005	233
5	Environmental mutagenesis during the end-Permian ecological crisis Proceedings of the National Academy of Sciences ·Henk Visscher, Cindy V. Looy, Margaret E. Collinson, Henk Brinkhuis, Johanna H.A. van Konijnenburg‐van Cittert, Wolfram M. Kürschner, Mark A. Sephton	2004	201
6	Carbon and nitrogen in carbonaceous chondrites: Elemental abundances and stable isotopic compositions Meteoritics and Planetary Science ·V. K. Pearson, Mark A. Sephton, I. A. Franchi, J. M. Gibson, I. Gilmour	2006	159
7	Searching for Life on Mars: Selection of Molecular Targets for ESA's Aurora ExoMars Mission Astrobiology ·John Parnell, David C. Cullen, M. R. Sims, Stephen A. Bowden, Charles S. Cockell, Richard W. Court, P. Ehrenfreund, F. Gaubert, Will Grant, Vı́ctor Parro, Michel Rohmer, Mark A. Sephton, Helga Stan‐Lotter, A. Steele, J. Toporski, Jorge L. Vago	2007	128
8	Shock synthesis of amino acids from impacting cometary and icy planet surface analogues Nature Geoscience ·Zita Martins, M. C. Price, Nir Goldman, Mark A. Sephton, M. J. Burchell	2013	118
9	Investigating the variations in carbon and nitrogen isotopes in carbonaceous chondrites Geochimica et Cosmochimica Acta ·Mark A. Sephton, A. B. Verchovsky, P. A. Bland, I. Gilmour, M. M. Grady, I. P. Wright	2003	117
10	Defining biominerals and organominerals: Direct and indirect indicators of life Sedimentary Geology ·Randall S. Perry, Nicola McLoughlin, Bridget Y. Lynne, Mark A. Sephton, Joan D. Oliver, Carole C. Perry, Kathleen A. Campbell, Michael H. Engel, Jack D. Farmer, Martin D. Brasier, James T. Staley	2007	111
11	Clay mineral‐organic matter relationships in the early solar system Meteoritics and Planetary Science ·V. K. Pearson, Mark A. Sephton, A. T. Kearsley, P. A. Bland, I. A. Franchi, I. Gilmour	2002	107
12	δ13C of free and macromolecular aromatic structures in the murchison meteorite Geochimica et Cosmochimica Acta ·Mark A. Sephton, C. T. Pillinger, I. Gilmour	1998	107
13	Analysis of conjugated steroid androgens: Deconjugation, derivatisation and associated issues Journal of Pharmaceutical and Biomedical Analysis ·Rachel L. Gomes, William Meredith, Colin E. Snape, Mark A. Sephton	2009	100
14	Aromatic moieties in meteoritic macromolecular materials: analyses by hydrous pyrolysis and δ13C of individual compounds Geochimica et Cosmochimica Acta ·Mark A. Sephton, C. T. Pillinger, I. Gilmour	2000	95
15	Hydropyrolysis of insoluble carbonaceous matter in the Murchison meteorite: new insights into its macromolecular structure 1 1Associate editor: G. D. Cody Geochimica et Cosmochimica Acta ·Mark A. Sephton, Gordon D. Love, Jonathan S. Watson, A. B. Verchovsky, I. P. Wright, Colin E. Snape, I. Gilmour	2004	95
16	Carbon molecules in space: from astrochemistry to astrobiology Faraday Discussions ·P. Ehrenfreund, Mark A. Sephton	2006	93
17	The end Triassic mass extinction record of Williston Lake, British Columbia Palaeogeography Palaeoclimatology Palaeoecology ·Paul B. Wignall, John‐Paul Zonneveld, Robert J. Newton, K. Amor, Mark A. Sephton, Stephen Hartley	2007	90
18	Adsorption of l-lysine on montmorillonite Colloids and Surfaces A Physicochemical and Engineering Aspects ·Anita Parbhakar-Fox, Javier Cuadros, Mark A. Sephton, William E. Dubbin, Barry J. Coles, Dominik Weiß	2007	78
19	Carbon and nitrogen isotope disturbances and an end-Norian (Late Triassic) extinction event Geology ·Mark A. Sephton, Ken Amor, I. A. Franchi, Paul B. Wignall, Robert J. Newton, John‐Paul Zonneveld	2002	77
20	A new thermal extraction protocol to evaluate liquid rich unconventional oil in place and in-situ fluid chemistry Marine and Petroleum Geology ·Michael A. Abrams, Changrui Gong, C. Garnier, Mark A. Sephton	2017	75

About Mark A. Sephton

Mark A. Sephton is a scholar working on Astronomy and Astrophysics, Ecology, Mechanics of Materials, Atmospheric Science and Paleontology, having authored 242 papers that have together received 6.6k indexed citations. Recurring topics across this work include Astro and Planetary Science (131 papers), Planetary Science and Exploration (97 papers), Isotope Analysis in Ecology (80 papers), Hydrocarbon exploration and reservoir analysis (31 papers), Paleontology and Stratigraphy of Fossils (28 papers), Geology and Paleoclimatology Research (25 papers), Space Science and Extraterrestrial Life (21 papers) and Mass Spectrometry Techniques and Applications (18 papers). The work is most often cited by research in Astronomy and Astrophysics (3.6k citations), Paleontology (1.1k citations), Geochemistry and Petrology (458 citations), Geophysics (812 citations) and Ecology (1.5k citations). Mark A. Sephton has collaborated with scholars based in United Kingdom, United States and Netherlands. Frequent co-authors include I. Gilmour, Jonathan S. Watson, Zita Martins, Richard W. Court, P. Ehrenfreund, Cindy V. Looy, Henk Visscher, C. T. Pillinger, Oliver Botta and V. K. Pearson. Their work appears in journals such as Astrobiology, Planetary and Space Science, Meteoritics and Planetary Science, Geochimica et Cosmochimica Acta and International Journal of Astrobiology.

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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Mark A. Sephton

Mark A. Sephton's Hit Papers

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