Definitions
from The Century Dictionary.
- Pertaining to or of the nature of trap or trap-rock.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Min.) Of or pertaining to trap; being of the nature of trap.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective mineralogy Of or pertaining to
trap ; of the nature of trap.
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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Dark trappean rocks full of hornblende have in many places burst through these schists, and appear in nodules on the surface.
A Popular Account of Dr. Livingstone's Expedition to the Zambesi and Its Tributaries 2004
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In fact, the great plutonic action is confined to the central portion of the island; there, rocks of the trappean and volcanic class, including trachyte, basalt, and tuffs and agglomerates associated with streams of lava, have made this a land of supernatural horrors.
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By what train of investigations were geologists induced at length to reject these views, and to assent to the igneous origin of the trappean formations?
The Harvard Classics Volume 38 Scientific Papers (Physiology, Medicine, Surgery, Geology) Various
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By what train of investigations were geologists induced at length to reject these views, and to assent to the igneous origin of the trappean formations?
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In fact, the great plutonic action is confined to the central portion of the island; there, rocks of the trappean and volcanic class, including trachyte, basalt, and tuffs and agglomerates associated with streams of lava, have made this a land of supernatural horrors.
A Journey to the Interior of the Earth Jules Verne 1866
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The lodes are not ribboned, but consist of quartz, jointed across from side to side, exactly like trappean dykes.
The Naturalist in Nicaragua Thomas Belt 1855
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These, however, were sufficient to show me that the gneiss of Depilto was overlain conformably by the contorted schists; that the latter were followed by soft trappean beds, and these by thick beds of quartz-conglomerate, apparently derived from the degradation of the schistose rocks, with their numerous quartz veins.
The Naturalist in Nicaragua Thomas Belt 1855
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This peculiar form, and the symmetrical arrangement of a few cones which surround the Brigantine, made me at first think that this group, which is wholly calcareous, contained rocks of basaltic or trappean formation.
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Fragments of granite have been observed at Teneriffe; the island of Gomora, from the details furnished me by M. Broussonnet, contains a nucleus of micaceous schist: — the quartz disseminated in the sand, which we found on the shore of Graciosa, is a different substance from the lavas and the trappean porphyries so intimately connected with volcanic productions.
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This regular disposition of lithoid basaltic lava and feldsparry vitreous lava is analogous to the phenomena of all trappean mountains; it reminds us of those phonolites lying in very ancient basalts, those close mixtures of augite and feldspar which cover the hills of wacke or porous amygdaloids: but why are the porphyritic or feldsparry lavas of the Peak found only on the summit of the volcano?
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