Sentence examples for black tephra from inspiring English sources
Phreatomagmatic and phreatic eruptions are short-lived explosions accompanied by an upward rush of black tephra (Kokelaar and Durant [1983]) jets spread into cockscomb or cypress tree shapes (Kokelaar [1983]) (Figure 5).
Concerning the reconstruction of the deposit, our simulations suggest a slightly thinner tephra blanket in the East Black Sea than Costa et al. (2012).
Locations where tephra was identified have thick black outlines.
Control poits by correlative tephra layers are shown by black lines.
Control points by correlative tephra layers are shown by black triangles.
Control points by correlative tephra layers are shown by vertical black lines.
However, radiocarbon dating results, tephra layers, brown peats, and the black peaty silt were useful as key beds to correlate event layers.
d Coarse-grained and pumiceous tephra bed with sharp bottom and top boundaries e Tephra bed composed of lower fine-grained (light), middle pumiceous coarse-grained (black), and upper fine-grained (gray) parts.
Tephra layers for whom geochemical data was obtained are given as black bars, and layers that can be correlated with known eruptions are listed in black: Dom-2= Sluggan B Tephra; Dom-5= Glenn Garry Tephra; Dom-7= Hekla 3 Tephra; Dom-8= Hekla 2/Selsund Tephra; Dom-9= Hekla 4; Dom-12= Lairg B Tephra.
Palagonitization and lithification of the Surtsey tephra.
