Malcolm Lecompte

Malcolm Lecompte
Elizabeth City State University | ECSU · Center of Excellence in Remote Sensing Research and Education

Ph.D.

About

55
Publications
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510
Citations

Publications

Publications (55)
Article
Full-text available
We present evidence that in ~ 1650 BCE (~ 3600 years ago), a cosmic airburst destroyed Tall el-Hammam, a Middle-Bronze-Age city in the southern Jordan Valley northeast of the Dead Sea. The proposed airburst was larger than the 1908 explosion over Tunguska, Russia, where a ~ 50-m-wide bolide detonated with ~ 1000× more energy than the Hiroshima atom...
Article
Full-text available
At Abu Hureyra (AH), Syria, the 12,800-year-old Younger Dryas boundary layer (YDB) contains peak abundances in meltglass, nanodiamonds, microspherules, and charcoal. AH meltglass comprises 1.6 wt.% of bulk sediment, and crossed polarizers indicate that the meltglass is isotropic. High YDB concentrations of iridium, platinum, nickel, and cobalt sugg...
Chapter
The Younger Dryas (YD) impact hypothesis proposes that fragments of a large, disintegrating asteroid/comet struck the Earth ∼12,800 years ago. This event simultaneously deposited high concentrations of platinum, high-temperature spherules, melt glass and nanodiamonds into the YD boundary layer (YDB) at >50 sites worldwide. Here, we report on a ∼12,...
Article
Multi-proxy analyses of a sequence spanning the Younger Dryas (YD) in the Glacial Lake Hind basin of Manitoba provides insight into regional paleohydrology and paleovegetation of meltwater rivers and lakes spanning >4000 yr; the sequence is controlled by 25 new accelerator mass spectrometry ages. This lake, dammed by the Laurentide Ice Sheet, overf...
Article
Full-text available
The Younger Dryas (YD) impact hypothesis posits that fragments of a large, disintegrating asteroid/comet struck North America, South America, Europe, and western Asia ~12,800 years ago. Multiple airbursts/impacts produced the YD boundary layer (YDB), depositing peak concentrations of platinum, high-temperature spherules, meltglass, and nanodiamonds...
Conference Paper
Full-text available
This paper overviews the multiple lines of evidence that collectively suggest a Tunguska-like, cosmic airburst event that obliterated civilization-including the Middle Bronze Age (MBA) city-state anchored by Tall el-Hammam-in the Middle Ghor (the 25 km diameter circular plain immediately north of the Dead Sea) ca. 1700 BCE, or 3700 years before pre...
Chapter
The Younger Dryas cooling episode came about in the Northern Hemisphere in an abrupt manner atypical of deglaciation events. This cooling resulted in the Pleistocene extinctions of many genera of faunas and coincided with the disappearance of the Clovis culture. The Younger Dryas Cosmic Impact of 12.8 kya is then considered as a hypothesis that exp...
Chapter
Chapter 8 reviews the evidence for a suspected cosmic impact over North America at the onset of the Younger Dryas climatic period with the near simultaneous extinction of classic Pleistocene megafauna and the Clovis technoculture. The impact related proxies that are used to detect the impact layer, such as spherules, silica-rich glass, nanodiamonds...
Article
Full-text available
The Younger Dryas boundary (YDB) cosmic-impact hypothesis is based on considerable evidence that Earth collided with fragments of a disintegrating ≥100-km-diameter comet, the remnants of which persist within the inner solar system ∼12,800 y later. Evidence suggests that the YDB cosmic impact triggered an “impact winter” and the subsequent Younger D...
Article
Full-text available
Part 1 of this study investigated evidence of biomass burning in global ice records, and here we continue to test the hypothesis that an impact event at the Younger Dryas boundary (YDB) caused an anomalously intense episode of biomass burning at ∼12.8 ka on a multicontinental scale (North and South America, Europe, and Asia). Quantitative analyses...
Article
Full-text available
Previously, a large platinum (Pt) anomaly was reported in the Greenland ice sheet at the Younger Dryas boundary (YDB) (12,800 Cal B.P.). In order to evaluate its geographic extent, fire-assay and inductively coupled plasma mass spectrometry (FA and ICP-MS) elemental analyses were performed on 11 widely separated archaeological bulk sedimentary sequ...
Article
Full-text available
Previous evidence for fragments of a cosmic airburst in the Western Alps has been shown to reside in weathering rinds in surface clasts of Late Glacial (LG) (mid-LG-post Allerød) deposits and in Ah horizons of several associated paleosols. In contrast to outlying strata, Younger Dryas (YD) paleosol horizons contain minor reworked airburst evidence...
Article
Full-text available
Holliday (1) rejects age-depth models for the Younger Dryas boundary layer (YDB) in Kennett et al. (2), claiming that they are incorrect for several reasons, including age reversals, high age uncertainties, and use of optically stimulated luminescence (OSL) dating. These same claims previously were presented in Meltzer et al. (3) and were discussed...
Article
Full-text available
The Younger Dryas impact hypothesis posits that a cosmic impact across much of the Northern Hemisphere deposited the Younger Dryas boundary (YDB) layer, containing peak abundances in a variable assemblage of proxies, including magnetic and glassy impact-related spherules, high-temperature minerals and melt glass, nanodiamonds, carbon spherules, aci...
Conference Paper
Full-text available
A sediment column (0-110 cm) from Squires Ridge (38ED365), a stratified archaeological site on the Tar River in North Carolina, was analyzed to evaluate magnetic microspherules and other geochemical markers reported for the Younger Dryas Boundary (YDB). Here we report on microspherules using a Scanning Electron Microscope (SEM) and Energy Dispersiv...
Article
Full-text available
The presence of Mn-Fe nodules in the epipedons (surface horizons) of paleosols of presumed Upper Neogene age in the northwestern Venezuelan Andes have been interpreted as products of inorganic oxidation and reduction processes operating over the full range of glacial and interglacial cycles that affected paleosol morphogenesis. New microscopic/chem...
Article
Full-text available
One or more bolide impacts are hypothesized to have triggered the Younger Dryas cooling at ∼12.9 ka. In support of this hypothesis, varying peak abundances of magnetic grains with iridium and magnetic microspherules have been reported at the Younger Dryas boundary (YDB). We show that bulk sediment and/or magnetic grains/microspherules collected fro...
Article
Gradual reduction of a small ice shelf in the Pine Island Bay area is measured using eleven Landsat images spanning 1972 to 2003. Measurements of Ice shelf area indicate that it expanded slightly during the first two decades of observations from approximately 6.19 km 2 measured on December 7, 1972 to a maximum of about 6.82 km2 observed in 1986. Th...
Article
Full-text available
In PNAS, M. Boslough (1) raises issues about carbon spherules and nanodiamonds unrelated to our magnetic spherule focused research (2). Boslough should instead address the questions he raises to the appropriate investigators.
Article
Full-text available
Firestone et al. sampled sedimentary sequences at many sites across North America, Europe, and Asia [Firestone RB, et al. (2007) Proc Natl Acad Sci USA 106:16016-16021]. In sediments dated to the Younger Dryas onset or Boundary (YDB) approximately 12,900 calendar years ago, Firestone et al. reported discovery of markers, including nanodiamonds, aci...
Article
This study examines the feasibility of human exploration of near-Earth asteroids before 2030. Missions are assumed possible with the development of upgraded expendable launch vehicles and a spacecraft similar to the Constellation Program's Orion crew exploration vehicle. Candidate objects and opportunities were determined by filtering a Jet Propuls...
Article
Evidence for the harsh climate prevalent during the Last Glacial Maximum (LGM) are seen in topographical features visible south of the ice sheet margin in the uplands and coastal regions of the southeastern United States. Among the features attributed to ice age climate are numerous elliptical, shallow depressions called collectively Carolina Bays,...
Article
Watershed Watch (NSF-DUE-STEP 0525433) engages early undergraduate students from two-year and four-year colleges in student-driven full inquiry-based instruction in biogeoscience. Program goals for Watershed Watch are to test if inquiry-rich student-driven projects sufficiently engage undeclared students (or noncommittal STEM majors) to declare a S...
Article
Firestone and others proposed an extraterrestrial (ET) impact upon the Laurentide Ice Sheet 12,900 years ago led to abrupt climate change and left behind a distinct suite of microscopic soil markers. If so, then soil memory of such an extreme event should be apparent across a wide swath of ice-marginal North America. New Jersey's Pine Barrens has a...
Article
With the nation challenged to comply with Executive Order 12906 and its needs to augment the Science, Technology, Engineering and Mathematics (STEM) pipeline, applied focus on geosciences pipelines issue may be at risk. The Geosciences pipeline may require intentional K-12 standard course of study consideration in the form of project based, science...
Article
Stratigraphic analyses of soil samples taken from dated and undated sites located along the mid-Atlantic Coastal Plain have yielded evidence of increased contemporary biomass burning, compared to under and overlying strata. Host strata ages are known or projected to bracket the onset of the Younger Dryas cooling episode at 12.9 cal ka. This ongoing...
Article
Full-text available
Despite increases over the last two decades in the degrees awarded to underrepresented students in science, technology, engineering, and mathematics (STEM) disciplines, enhancing diversity in these disciplines remains a significant challenge. This paper describes a strategic approach to this challenge via the development of a collaborative partners...
Article
Development of the Ares launch system and Orion Crew Exploration Vehicle open up a number of possible opportunities in the inner solar system for human exploration. Of particular interest in this regard are near-Earth objects (NEOs).
Conference Paper
Detection of archaeological sites may be accomplished by several means including visual aerial reconnaissance and the me of remote sensors as aerial cameras, thermal infrared scanners, multispectral scanners, and space-borne radar. Remote sensing has proven to be useful in locating both surface and subsurface archaeological features. Much of human...
Article
Imaging the earth from Geostationary Earth Orbit (GEO) allows frequent updates of environmental conditions within an observable hemisphere at time and spatial scales appropriate to the most transient observable terrestrial phenomena. Coverage provided by current GEO Meteorological Satellites (METSATS) fails to fully exploit this advantage due prima...
Article
Full-text available
Earth Imaging from Geostationary Earth Orbit (GEO) allows frequent sampling of the environment within an observable hemisphere. GEO Meteorological Satellites, have exploited this advantage for over three decades. Visual imaging from these satellites could be characterized as low in spatial and temporal resolution. The absence of ‘true color’, and h...
Article
The passive multispectral IR polarization signature attributes of mines and background are observable to an appropriately designed detection system. The processes that create signature polarization are spectrally dependent. At shorter wavelengths, reflected solar radiation produces polarization which is perpendicular to the plane of incidence. At l...
Article
Different Mars mission designs recently proposed are examined to illustrate the principal features of possible chemical rocket propellants from native resources on the Martian surface. A simple analytic tool developed to compare different mission approaches including the impact of in situ propellant production is examined. Quantitative criteria to...
Article
Data obtained by the Pioneer Venus Orbiter's UV spectrometer for the limb profiles near periapsis, with the instrument's grating set to a bandpass-center wavelength of 297 nm, are analyzed to identify the sources giving rise to the observed signals, which are forbidden O I 2972 A and C I 2967 A. Structure in the forbidden O I 2972 A emission profil...
Article
The ultraviolet nitric oxide spectrometer (UVNO) experiment on the Atmosphere Explorer D (AE-D) satellite measured thermospheric nitric oxide during the winter of 1974-1975 using resonant fluorescence from the 1-0 gamma band of the molecule. Almost complete latitude coverage was obtained, but the observations were confined to morning local times cl...
Article
Recent analyses of the Atmosphere Explorer data are discussed in which it is demonstrated that the satellite glows have two components, one at high altitudes which is consistent with excitation in single collisions of atmospheric oxygen atoms with the vehicle surface and the other at low altitudes which is consistent with double collisions of nitro...
Article
Earth Imaging from Geostationary Earth Orbit (GEO) allows frequent sampling of the environment within an observable hemisphere. GEO Meteorological Satellites, have exploited this advantage for over three decades. Visual imaging from these satellites could be characterized as low in spatial and temporal resolution. The absence of 'true color', and h...
Article
The wind-driven seaward movement of warm coastal surface water and its associated displacement by cold bottom water describes the oceanic process of coastal upwelling. As cold deep water rises to the surface, vital nutrients necessary to sustain abundant and varied sea life are replenished. Although marine ecosystems may be periodically enriched du...

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Projects

Projects (4)
Project
Search for evidence of impacts associated with mass extinctions. Evidence can be direct, such as impact-generated nanodiamonds, or indirect, in the form of soot from impact-triggered wildfires.