What is "rocky ripple"

Population (2000): 712
Housing Units (2000): 329
Land area (2000): 0.304467 sq. miles (0.788567 sq. km)
Water area (2000): 0.000000 sq. miles (0.000000 sq. km)
Total area (2000): 0.304467 sq. miles (0.788567 sq. km)
FIPS code: 65556
Located within: Indiana (IN), FIPS 18
Location: 39.847091 N, 86.173137 W
ZIP Codes (1990):
Note: some ZIP codes may be omitted esp. for suburbs.
Headwords: