...It is probably part of the latest series of volcanic rocks in South Africa... 
David Livingstone 「Missionary Travels and Researches in South 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」
...The rich volcanic earths of these places will enable them to competein the matter of plantations with any part of the known world...
Mary H. Kingsley 「Travels in West Africa」
...Then one morning we came on deck to find ourselves close aboard a number of volcanic islands...
Stewart Edward White 「African Camp Fires」
...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 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」
...The living species of pygmy mice resulted from a geographicseparation, perhaps occurring in the Iowan glacial period (See DeTerra, 1949:51) in the transverse volcanic zone of central México...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...The soil in this cañon was not deep and consistedof a rocky, marly mixture, pale red in color, evidently produced byweathering of the reddish volcanic rocks bordering the cañon...
Rollin H. Baker 「Two New Moles (Genus Scalopus) from Mexico and Texas」
...Catacombs, however,could not be excavated everywhere, the presence of veins orbeds of soft volcanic stone being a condition sine qua nonof their existence...
Rodolfo Lanciani 「Pagan and Christian Rome」
...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」
... That is to say, a flinty volcanic ash...
John Ruskin 「The Poetry of Architecture」
...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」
...Itexhibits the same evidences of recent volcanic activity as theneighbourhood of Lakes Tartarus and Solfatara on the way to Tivoli...
Hugh Macmillan 「Roman Mosaics」
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