A stalagmite is a rock formation that grows upwards from the floor of a cave, usually made of minerals and formed by dripping water over a long period of time. Full definition
In this case, the researchers combined records of ancient lake levels, location and extent of glaciation, variations in the composition of stalagmites in caves, and evidence for changes in vegetation and subsurface soil deposits associated with water table depth. (sciencedaily.com)
The team gathered data from stalagmites in Nevada and New Mexico. (unlv.edu)
In the jungles, south of Playa del Carmen, paddlers can explore an underground river that passes through caves decorated with thousands of intricate stalagmite formations. (caradonna.com)