The basalt itself, outcropping at the crest of the hill, is " dark greenish gray to grayish black, medium grained, and moderately porphyritic.
12.
The flow banding and fine to medium grained appearance of the deposit suggests a fairly rapid cooling event and appears to have been deposited in a submerged environment.
13.
For example, the upper layer of the Main Mass of the 1850 Ma Sudbury Structure is composed of fine-medium grained granitic rocks with abundant granophyric textures.
14.
The Alaskite Zone is aptly named for the white, fine to medium grained quartz feldspar porphyry intrusive that was recognized and mapped in outcrop in 1967 as alaskite.
15.
Due to orogenic activity during the Devonian, Mount Desert Island has three granite units, the Cadillac Mountain granite, the fine grained Somesville granite, and the medium grained Somesville granite.
16.
The Aquia Formation is composed of marine sediments that are dark green to gray-green, argillaceous, highly glauconitic, well sorted fine-to medium grained sand with shell beds up to in depth.
17.
Group I kimberlites exhibit a distinctive inequigranular texture caused by macrocrystic ( ) to megacrystic ( ) phenocrysts of olivine, pyrope, chromian diopside, magnesian ilmenite and phlogopite, in a fine to medium grained groundmass.
18.
Located on the A68 road just south of Darney Crag, it was created in conjunction with the Darney quarry, which provided its distinct fine to medium grained pale gold through, light buff to almost blond in colour sandstone.
19.
In south central Pennsylvania, the Marcellus is mapped with three members, from top to base : The Mahanoy Member ( Dmm ), a dark gray to grayish black silty shale and siltstone; the Turkey Ridge Member ( Dmt ), an olive to dark-gray fine to medium grained sandstone; and the Shamokin Member ( Dms ), a dark gray to grayish black fissile carbonaceous shale that is calcareous in places near the base.
