>>145323>>145328>>145265>geologist's hammer.Maybe because they are the exact same thing. Some have points and some have chisels, but both are geologist's hammers. Both types are for specific uses,
http://en.wikipedia.org/wiki/Geologist%27s_hammerGeologist's hammers, as with most hammers, have two heads, one on either side. Most commonly the tool consists of a combination of a flat head, with either a chisel or a pick head at the other end.[1]
A chisel head (pictured), which is shaped like a chisel, is useful for clearing covering vegetation from exposures and is sometimes (though inadvisedly) used to pry open fissures. Some rocks can be easily split, like slate or shale, to reveal any fossils.
A pick head, which terminates in a sharp point to deliver maximum pressure, is often preferred for harder rocks. A geologist's hammer bearing a pick end is often referred to as a rock pick or geological pick instead of a geologist's hammer.
A flat head is used to deliver a blow to a rock with the intention of splitting it. Specimens or samples can be trimmed to remove sharp corners or reduce in size.
