The blood pressure decreases and complaints, such as fatigue and lassitude, make themselves felt. These symptoms may also occur after the meal because the blood gathers in the area of the digestive organs and is missing in the brain. Dizziness.
Non-foliated metamorphic rocks such as hornfels, marble, quartzite, and novaculite do not have a layered or banded appearance. Pictures and brief descriptions of some common types of metamorphic rocks are shown on this page. Hornfels is a fine-grained nonfoliated metamorphic rock with no specific composition.
Gneiss Examples. This sample of gneiss rock shows layering of two different kinds of rock, leading to its classification as a metamorphic rock. The layering also shows bending, suggesting that it has been subject to pressures. This rock was included in a display of geologic ages at the Smithsonian Museum of Natural History.