16 citations · 26 across the 5 of their papers we have counts for
5 papers
Incidence of low-density meteoroids of the Polonnaruwa type
N. C. Wickramasinghe, J. Wallis, D. H. Wallis +8
The ingress of micrometeorites of cometary origin with densities below ~ 1 g cm-3 into the Earth could average at least 5 tonne per day. Although much of this is burnt upon entry t…
Fossil diatoms in a new carbonaceous meteorite
N. C. Wickramasinghe, J. Wallis, D. H. Wallis +1
We report the discovery for the first time of diatom frustules in a carbonaceous meteorite that fell in the North Central Province of Sri Lanka on 29 December 2012. Contamination i…
The Polonnaruwa meteorite: oxygen isotope, crystalline and biological composition
Jamie Wallis, Nori Miyake, Richard B. Hoover +7
Results of X-Ray Diffraction (XRD) analysis, Triple Oxygen Isotope analysis and Scanning Electron Microscopic (SEM) studies are presented for stone fragments recovered from the Nor…
Bacterial morphologies in carbonaceous meteorites and comet dust
N. Chandra Wickramasinghe, Max K. Wallis, Carl H. Gibson +3
Three decades ago the first convincing evidence of microbial fossils in carbonaceous chondrites was discovered and reported by Hans Dieter Pflug and his collaborators. In addition…
Evolution of primordial planets in relation to the cosmological origin of life
N. Chandra Wickramasinghe, Jamie H. Wallis, Carl H. Gibson +1
We explore the conditions prevailing in primordial planets in the framework of the HGD cosmologies as discussed by Gibson and Schild. The initial stages of condensation of planet-m…