Two ways of dating fossils dating the same birthday

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

Sahelanthropus tchadensis Orrorin tugenensis Ardipithecus ramidus Australopithecus anamensis Australopithecus afarensis Kenyanthropus platyops Australopithecus africanus Australopithecus garhi Australopithecus sediba Australopithecus aethiopicus Australopithecus robustus Australopithecus boisei Homo habilis Homo georgicus Homo erectus Homo ergaster Homo antecessor Homo heidelbergensis Homo neanderthalensis Homo floresiensis Homo sapiens sapiens Some scientists use a broader definition of Hominidae which includes the great apes, and instead call the group I am discussing "hominins".

For a good discussion of the hominid/hominin terminology issue, read this article by Lee Berger.

(Creationist arguments) KP 29281, Australopithecus anamensis Discovered by Peter Nzube in 1994 at Kanapoi in Kenya (Leakey et al. This is a lower jaw with all its teeth which is about 4.0 million years old.

KP 29285, Australopithecus anamensis Discovered by Kamoya Kimeu in 1994 at Kanapoi in Kenya.

The age of the fossil must be determined so it can be compared to other fossil species from the same time period.

Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

2) To familiarize students with the concept of half-life in radioactive decay.

3) To have students see that individual runs of statistical processes are less predictable than the average of many runs (or that runs with relatively small numbers involved are less dependable than runs with many numbers).

Sahelanthropus tchadensis Ardipithecus ramidus Australopithecus anamensis Australopithecus afarensis Kenyanthropus platyops Australopithecus africanus Australopithecus garhi Australopithecus sediba Australopithecus aethiopicus Australopithecus robustus This list includes fossils that are important for either their scientific or historic interest, or because they are often mentioned by creationists.

One sometimes reads that all hominid fossils could fit in a coffin, or on a table, or a billiard table.

Each entry will consist of a specimen number if known (or the site name, if many fossils were found in one place), any nicknames in quotes, and a species name. ARA-VP-6/500, "Ardi", Ardipithecus ramidus Discovered by a team led by Tim White in 1994 at Aramis in Ethiopia (White et al. KP 271, "Kanapoi Hominid", Australopithecus anamensis Discovered by Bryan Patterson in 1965 at Kanapoi in Kenya (Patterson and Howells 1967).