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According to Professor Ramsay, their thickness is about 3300 feet in North Wales, including those of the Lower Llandeilo. The lavas are feldspathic, and of porphyritic structure, and, according to the same authority, of an aggregate thickness of 2500 feet. Arenicolites linearis, Hall. Arenig beds, Stiper-Stones. a. Didymograpsus geminus, Hisinger, sp.
I have noted the only two patches of grass found during the 'jornada. There were scattered, at wide intervals, the Palafoxia linearis, Atriplex, Encelia farinosa, Daleas, Euphorbias, and a Simsia, described by Dr. Torrey as a new species.
Among the evening primroses the Missouri one is the brightest and biggest; speciosa, white, from Texas, of blossoms the most prolific; glauca, riparia, fruticera, and linearis, all yellow; many others, though perennial, are best treated as annual or biennial. The spiked loosestrife planted by the water's edge of a pond is far finer than in the garden border. It has hundreds of red spikes.
The place of the sandstones of the Foreland is not yet clearly made out, as they are cut off by a great fault and disturbance. Spirifera disjuncta, Sowerby. Syn. Sp. Verneuilii, Murch. Phacops latifrons, Bronn. Clymenia linearis, Munster. The fossils are numerous, and comprise about 150 species of mollusca, a fifth of which pass up into the overlying Carboniferous rocks.
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