2003) record saponite as the main phyllosilicate in the contact between the marl-limestone rhythmite and doleritic laccolith
of Sierra de Priego (Cordoba), as a consequence of a late hydrothermal process after contact metamorphism produced by the intrusion of subvolcanic rocks.
Coal formations, located in two synclines (Gorce and Sobiccin) separated by the Chetmiec rhyolite laccolith
, are often disturbed by tectonic discontinuities and porphyry intrusions.
These bodies are found in roof pendants suspended in the Iron Mountain laccolith
as well as along the flanks of the laccolith
Johnson & Pollard (7) recognise that laccolith
formation is characterised by three distinct stages.
The 'bun' may be the result of what is known on Earth as a laccolith
, an intrusion formed by magma pushing up from below.
Gas pressure built up at the top of the laccolith
, fracturing overlying rocks.
Whilst he was in fact describing an actual geological feature--a laccolith
which he saw as resembling a cactus --he was also, tongue-in-cheek, commenting on what he saw as an absurd number of "-lith" words in the field of Geology.
Some geologists believe Devils Tower began as a laccolith
, a buried intrusion of igneous rock; others say it is a volcanic plug, the leftover spout of an extinct volcano.
Ongoing field mapping of Cretaceous sedimentary rocks has identified numerous intrusions that appear to be cross cut by Laramide and post-Laramide deformation in the South Persimmon Gap Laccolith
(SPGL) and Dagger Mountain areas.
Kelsey-Fry (still representing Fallon) observes that Murrihy "opined", a word that, along with rostral and laccolith
, you very rarely hear.
It was probably a laccolith
that was exposed by erosion and tectonic uplift, evidenced by the occurrence of a fault line a few kilometers from the site.
The country rock in the district consists of Cretaceous thinbedded limestones and shales that have been injected with felsic eruptive rocks, the largest mass of which is the granodiorite laccolith
forming San Pedro Peak near the center of the property.