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Anatomically they possess pseudoparenchymatous mantle layers with angular cells throughout and emanating hyphae with wide diameter and simple septa (Plate 1B; Plate 2O-Q).
Tim Johnson and his collaborators at the US-American universities of Maryland, Southern California, and Yale have established that the mineral assemblages that formed at the base of a 45-kilometer-thick magnesium-rich crust were denser than the underlying mantle layer.
In one example, the golf ball contained a magnetic core; in another, the mantle layer was magnetic.