..."Indeed," said Gideon Spilett, "this gulf is a regular abyss; but,taking into consideration the volcanic origin of the island, it is notastonishing that the sea should offer similar depressions... 
Jules Verne William Henry Giles Kingston 「Abandoned」
...This has evidently been brought to the surface by volcanic action at a later period than the coal formation...
David Livingstone 「Missionary Travels and Researches in South Africa」
...Nassau says it is always said tobe north of Gaboon; but so far no white man has any knowledge of anactive volcano there, although the district is of volcanic origin...
Mary H. Kingsley 「Travels in West Africa」
...There are only two distinct peaks to this glorious thing that geologistsbrutally call the volcanic intrusive mass of the Cameroon Mountains,viz...
Mary H. Kingsley 「Travels in West Africa」
...Here and there on them rose many small cones and craters, lava flows and other varied evidences of recent volcanic activity...
Stewart Edward White 「African Camp Fires」
...Aheer appears to be a region essentially of granite,although here and there are volcanic cones strikingup, composed of basalt, or a variety of this stone...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...Overweg believes it to bebasalt, or a species of volcanic stone of similarcharacter...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...A high volcanic peak, hills covered with wood, and spots of ground reminding us of the lawns or pasture-lands of our own country...
Horatio Bridge 「Journal of an African Cruiser」
...A mark, resembling in shape a horse'shoof, was discernible in the volcanic rock; and this mark was believedto have been made by one of the celestial chargers...
Angelo de Gubernatis 「Zoological Mythology, Volume I (of 2)」
...A trenched peniplane of greater relief and altitudethan the Colorado Piedmont, it is characterized by high mesas, extensivedissected lava-capped plateaus, deep canyons, and mountainsof volcanic origin...
Phillip M. Youngman 「Geographic Variation in the Pocket Gopher, Thomys bottae, in Colorado」
...(1949:51), parts of the higher regions in the Valley of México, andthe transverse volcanic zone in central México were glaciated...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...NNE Sogwi-ri were taken on September9 in damp substrate under volcanic rocks along a little-usedroad; although many rocks were overturned, only these two individualswere found...
Robert G Webb 「Some Reptiles and Amphibians from Korea」
...Eighteen miles farther eastward was anotherruined village built about the crater of a volcanic cone...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...There is no evidence of volcanic formation in the neighborhood, andthe surrounding rocks are limestones and sandstones...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...Recent geological observationshave traced in the Campagna volcanic matter produced at differentperiods, when the entire area of Rome and its vicinity was the seat ofactive plutonic agency...
Hugh Macmillan 「Roman Mosaics」
...The stone in which they are impressed is aspongy volcanic tuff, and the layer superimposed upon them in thequarry was of similar material...
Hugh Macmillan 「Roman Mosaics」
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