Vietnam or Thailand? Vote for the TOP Country of the Week!
Want to type faster? Practice with a typing test or have fun with typing games!
Updated: July 23, 2026
Several cases are on record of the same species presenting varieties in the upper and lower parts of the same formation. Thus Trautschold gives a number of instances with Ammonites, and Hilgendorf has described a most curious case of ten graduated forms of Planorbis multiformis in the successive beds of a fresh-water formation in Switzerland.
Word Of The Day
Others Looking