Bonnie M. Packer's research while affiliated with University of Texas at El Paso and other places
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Publications (6)
Cenozoic tectonic evolution of the Japanese rifted continental
arc-trench system is reflected in the detrital modes of sand and
sandstone deposited in forearc and backarc basins sampled by the Deep
Sea Drilling Project. At present, the Japan arc is divided into two
segments along a complex plate boundary where the Izu-Bonin Ridge
intersects the Jap...
Cellularly preserved filamentous and colonial fossil microorganisms have been discovered in bedded carbonaceous cherts from
the Early Archean Apex Basalt and Towers Formation of northwestern Western Australia. The cell types detected suggest that
cyanobacteria, and therefore oxygen-producing photosynthesis, may have been extant as early as 3.3 bill...
Sands derived from Quaternary and late Tertiary arc systems can be directly correlated with the tectonic setting of the marine basin in which they were deposited (trench, arc-trench gap, back arc, etc.), adjacent arc type continental margin versus intraoceanic; dissected versus undissected), and degree of arc/basin development at the time of deposi...
One hundred and twenty point counts of Oligocene to Recent sands and sandstones from DSDP sites in the Japan and Mariana intraoceanic forearc and backarc basins demonstrate that there is a clear compositional difference between the continentally influenced Japan forearc and backarc sediments, and the totally oceanic Mariana forearc and backarc sedi...
One hundred and twenty point counts of Oligocene to Recent sands and sandstones from DSDP sites in the Japan and Mariana intraoceanic forearc and backarc basins demonstrate that there is a clear compositional difference between the continentally influenced Japan forearc and backarc sediments, and the totally oceanic Mariana forearc and backarc sedi...
Citations
... Single crystals of plagioclase, hornblende, pyroxene and other monocrystalline grains are present (e.g. Packer and Ingersoll 1986;Smith and Lotosky 1995). Andesitic ash consists of mixtures of vitric, crystal and lithic components. ...
... The inset shows the location of the Nankai Trough in East Asia. accelerated delivery since ∼2 Ma (Marsaglia et al., 1992;Underwood & Fergusson, 2005;Underwood & Pickering, 2018;Usman et al., 2014). Sediment delivery accelerated as a result of the Izu-Bonin Arc collision with Honshu, combined with the uplift of eastern Honshu as a byproduct of the convergence between southwestern and northeastern Japan (G. ...
... Although, very limited information was available for the prokaryotic organisms when 'The Origin of Species' was published, or during Darwin's lifetime, he was cognizant of the fact that his new theory of evolution should apply to all forms of life including the monad(s) (Darwin 1887;O'Malley 2009). Nevertheless, Darwin's work primarily dealt with the macroscopic life forms covering Gupta the most recent <1.0 billion years (Ga), whereas prokaryotic organisms, which evolved >3.0 Ga ago, cover much of the earlier evolutionary history of life (Schopf 1978;Schopf and Packer 1987;Kasting 1993). Thus, an understanding of the evolutionary relationships among prokaryotic organisms is of central importance for deciphering the origin and diversification of different forms of life on earth (Gupta 1998a). ...
... We must keep in mind, though, that this study is constrained by the number and choice of organisms as well as by the evolutionary differences between them. For example, cyanobacteria evolved some 3.5 billion years ago, a time during which Earth received 0.75 times the solar constant and the atmosphere contained orders of magnitude more carbon dioxide and less oxygen and ozone, causing the surface of the Earth to receive higher amounts of X-ray and UV radiation (Cnossen et al., 2007;Hessler, n.d.;Kaltenegger et al., 2020;Kasting, 1993;Lehmer et al., 2020;Pavlov et al., 2000;Payne et al., 2020;Schopf and Packer, 1987;Walker, 1985). This could have influenced the evolutionary trajectory of cyanobacteria, leading them to adapt to and favor lower-intensity and less energetic light. ...
