R. M. E. Williams
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View article: Parallels between subaqueous ridges on Earth and Mars: a new morphological potential indicator for paleolake assessment
Parallels between subaqueous ridges on Earth and Mars: a new morphological potential indicator for paleolake assessment Open
Water levels in large lakes fluctuate in response to climatic cycles. Surface observations from rovers have validated past lakes on Mars, following multiple studies that inventoried candidate paleolake sites across the planet in satellite …
View article: Assessment of Martian Lake Hydrologic Index
Assessment of Martian Lake Hydrologic Index Open
Large lakes are sensitive to climate shifts. This study investigated an established terrestrial lake metric as a tool for differentiating climate regimes on Mars. A global survey of martian lake hydrologic index (HI), the ratio of lake are…
View article: DEPOSITIONAL ENVIRONMENT AND PALEOCLIMATE IMPLICATIONS OF THE AMAPARI MARKER BAND WAVE RIPPLES
DEPOSITIONAL ENVIRONMENT AND PALEOCLIMATE IMPLICATIONS OF THE AMAPARI MARKER BAND WAVE RIPPLES Open
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View article: Late‐Stage Aqueous Activity at Gale Crater, Mars, Recorded by Sediment Fans Eroded From Aeolis Mons
Late‐Stage Aqueous Activity at Gale Crater, Mars, Recorded by Sediment Fans Eroded From Aeolis Mons Open
Gale crater, the landing site of NASA's Curiosity rover, and the mountain at its center, Aeolis Mons, hosts an extensive record of sedimentary rocks, which provide a window into the climate history of Mars. Curiosity has demonstrated that …
View article: Depositional Environment of the Amapari Marker Band: Rising Water Levels Formed Kilometer‐Scale Lake in Gale Crater, Mars
Depositional Environment of the Amapari Marker Band: Rising Water Levels Formed Kilometer‐Scale Lake in Gale Crater, Mars Open
The Amapari Marker Band (AMB) is a layer within the Mount Sharp stratigraphy that has been mapped around the Gale crater in orbital images and was recently investigated up close by the Curiosity rover. Symmetric wave ripple marks within th…
View article: Insights from multi-process fan deposits in martian intracrater basins on post-Noachian climate change
Insights from multi-process fan deposits in martian intracrater basins on post-Noachian climate change Open
Alluvial fans are a sensitive record of environmental transitions. Prior studies have determined that martian fans are primarily located in impact crater basins and that fan deposition occurred principally between 3.7 and 3.3 Ga or later, …
View article: Pediment formation and subsequent erosion in Gale crater: Clues to the climate history of Mars
Pediment formation and subsequent erosion in Gale crater: Clues to the climate history of Mars Open
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View article: SEDIMENTARY EVOLUTION OF THE JEZERO WESTERN FAN, MARS
SEDIMENTARY EVOLUTION OF THE JEZERO WESTERN FAN, MARS Open
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View article: GNARALOO BAY: STRATIGRAPHIC RELATIONSHIPS AT THE APEX OF A MARTIAN FLUVIO-DELTAIC SYSTEM AT JEZERO CRATER, MARS
GNARALOO BAY: STRATIGRAPHIC RELATIONSHIPS AT THE APEX OF A MARTIAN FLUVIO-DELTAIC SYSTEM AT JEZERO CRATER, MARS Open
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View article: STRATIGRAPHY AND STRUCTURE OF THE MARGIN UNIT, JEZERO CRATER: IMPLICATIONS FOR FORMATION SETTING
STRATIGRAPHY AND STRUCTURE OF THE MARGIN UNIT, JEZERO CRATER: IMPLICATIONS FOR FORMATION SETTING Open
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View article: THE AMAPARI MARKER BAND, GALE CRATER, MARS: METAL ENRICHMENTS AND POTENTIAL MECHANISMS OF FORMATION
THE AMAPARI MARKER BAND, GALE CRATER, MARS: METAL ENRICHMENTS AND POTENTIAL MECHANISMS OF FORMATION Open
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View article: Constraints on Jezero paleolake history from its fluvial input
Constraints on Jezero paleolake history from its fluvial input Open
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View article: FIRST CONTACT WITH A ROCK AVALANCHE DEPOSIT ON MARS
FIRST CONTACT WITH A ROCK AVALANCHE DEPOSIT ON MARS Open
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View article: UP AND DOWN WENT JEZERO LAKE: SIGNIFICANT RESULTS FROM THE FIRST EVER SEQUENCE STRATIGRAPHIC ANALYSIS ON MARS
UP AND DOWN WENT JEZERO LAKE: SIGNIFICANT RESULTS FROM THE FIRST EVER SEQUENCE STRATIGRAPHIC ANALYSIS ON MARS Open
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View article: Landscape evolution on early Mars: insights from the Jezero western fan
Landscape evolution on early Mars: insights from the Jezero western fan Open
The modern surface of Mars does not sustain liquid water, however relict landforms observed on orbital images provide strong evidence of past aqueous activity. Nevertheless on-the-ground analysis of sedimentary strata are required to robus…
View article: Characterizing Hydrated Sulfates and Altered Phases in Jezero Crater Fan and Floor Geologic Units With SHERLOC on Mars 2020
Characterizing Hydrated Sulfates and Altered Phases in Jezero Crater Fan and Floor Geologic Units With SHERLOC on Mars 2020 Open
The Mars 2020 Perseverance rover has explored fluvio‐lacustrine sedimentary rocks within Jezero crater. Prior work showed that igneous crater floor Séítah and Máaz formations have mafic mineralogy with alteration phases that indicate multi…
View article: Depositional Facies and Sequence Stratigraphy of Kodiak Butte, Western Delta of Jezero Crater, Mars
Depositional Facies and Sequence Stratigraphy of Kodiak Butte, Western Delta of Jezero Crater, Mars Open
High‐resolution 2D and 3D data remotely acquired by SuperCam's Remote Micro‐Imager and Mastcam‐Z aboard the Perseverance rover enabled us to characterize the stratigraphic architecture and sedimentary record of the Kodiak butte, an isolate…
View article: The high-resolution map of Oxia Planum, Mars; the landing site of the ExoMars Rosalind Franklin rover mission
The high-resolution map of Oxia Planum, Mars; the landing site of the ExoMars Rosalind Franklin rover mission Open
This 1:30,000 scale geological map describes Oxia Planum, Mars, the landing site for the ExoMars Rosalind Franklin rover mission. The map represents our current understanding of bedrock units and their relationships prior to Rosa…
View article: PAST VARIATIONS OF WATER LEVEL OF JEZERO PALEOLAKE
PAST VARIATIONS OF WATER LEVEL OF JEZERO PALEOLAKE Open
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View article: SURFACE EXPRESSION AND GEOMETRIES OF DELTAIC DEPOSITS OF JEZERO WESTERN FAN TOP (MARS)
SURFACE EXPRESSION AND GEOMETRIES OF DELTAIC DEPOSITS OF JEZERO WESTERN FAN TOP (MARS) Open
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View article: IN SITU INVESTIGATION OF THE GEDIZ VALLIS RIDGE: A REMNANT LATE-STAGE DEBRIS FLOW DOMINATED FAN DEPOSIT IN GALE CRATER
IN SITU INVESTIGATION OF THE GEDIZ VALLIS RIDGE: A REMNANT LATE-STAGE DEBRIS FLOW DOMINATED FAN DEPOSIT IN GALE CRATER Open
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View article: Going With the Flow: Sedimentary Evolution of the Jezero Western Fan, Mars
Going With the Flow: Sedimentary Evolution of the Jezero Western Fan, Mars Open
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View article: Landscape evolution on early Mars: a look inside a martian fan system
Landscape evolution on early Mars: a look inside a martian fan system Open
The modern surface of Mars does not sustain liquid water, however relict landforms observed on orbital images provide strong evidence of past aqueous activity. Nevertheless on-the-ground analysis of sedimentary strata are required to robus…
View article: Reconstructing the Sedimentology and Depositional Setting of the Margin Unit, Jezero Crater
Reconstructing the Sedimentology and Depositional Setting of the Margin Unit, Jezero Crater Open
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View article: OVERVIEW OF THE MARS 2020 MISSION PERSEVERANCE ROVER THIRD SCIENCE CAMPAIGN: EXPLORING JEZERO CRATER’S UPPER FAN
OVERVIEW OF THE MARS 2020 MISSION PERSEVERANCE ROVER THIRD SCIENCE CAMPAIGN: EXPLORING JEZERO CRATER’S UPPER FAN Open
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View article: The Upper Gediz Vallis Ridge at Gale Crater: Sedimentary Rock Clasts Transported by a Late-Stage Debris Flow on Mars?
The Upper Gediz Vallis Ridge at Gale Crater: Sedimentary Rock Clasts Transported by a Late-Stage Debris Flow on Mars? Open
The Mars Science Laboratory (MSL) Curiosity rover continues to ascend Aeolis Mons in Gale crater, Mars, with the goal of characterising formerly habitable palaeoenvironments. Since September 2022, Curiosity has been traversing Gediz Vallis…
View article: Architecture of Fluvial and Deltaic Deposits Exposed Along the Eastern Edge of the Western Fan of Jezero Crater, Mars
Architecture of Fluvial and Deltaic Deposits Exposed Along the Eastern Edge of the Western Fan of Jezero Crater, Mars Open
Early observations from the Perseverance rover suggested a deltaic origin for the western fan of Jezero crater only from images of the Kodiak butte. Here, we use images from the SuperCam Remote Micro‐Imager and the Mastcam‐Z camera to anal…
View article: Sedimentology and Stratigraphy of the Shenandoah Formation, Western Fan, Jezero Crater, Mars
Sedimentology and Stratigraphy of the Shenandoah Formation, Western Fan, Jezero Crater, Mars Open
Sedimentary fans are key targets of exploration on Mars because they record the history of surface aqueous activity and habitability. The sedimentary fan extending from the Neretva Vallis breach of Jezero crater's western rim is one of the…
View article: Geochemistry of the Bradbury and Siccar point lithostratigraphic groups in Gale crater as seen by ChemCam: implications for regional paleoenvironmental evolution
Geochemistry of the Bradbury and Siccar point lithostratigraphic groups in Gale crater as seen by ChemCam: implications for regional paleoenvironmental evolution Open
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View article: Supplemental data from: "Depositional Facies and Sequence Stratigraphy of Kodiak butte, western Delta of Jezero crater, Mars"
Supplemental data from: "Depositional Facies and Sequence Stratigraphy of Kodiak butte, western Delta of Jezero crater, Mars" Open
Supplementary data for research article "Depositional Facies and Sequence Stratigraphy of Kodiak butte, western Delta of Jezero crater, Mars" submitted to the Journal of Geophysical Resercah: Planets, as part of the special collection "The…