See Also: harmonically(dictionary)
Pennsylvanian(dictionary)
Pennsylvanian Period(encyclopedia)

Pennsylvanian Period (sh) and harmonically (iou)


Pennsylvanian Period (sh)




In North America, the interval of geologic time roughly equivalent to what is internationally designated the Late Carboniferous Period (323-290 million years ago).

Because the rocks that originated during this span of time are widespread in the state of Pennsylvania, some U.S. geologists favour the term over Late Carboniferous Period, which was first adopted in Europe.


harmonically (iou)



harmonically adverb. L16.
[from HARMONIC or HARMONICAL: see -ICALLY.]
With harmony or concord (esp. of sounds); harmoniously. L16-L18.
Math. In a harmonic relation or proportion; in the manner of harmonic motion. L16.
Music. In relation to harmony. L18.