Fossils and Artifacts

Today during class, Mrs. Mathieson and the I.T. team helped us with computer access and passwords.

Then we discussed the difference between fossils and artifacts, and the students posed some excellent questions. Lindsay really stirred the pot when she asked whether all seashells are considered to be fossils.

Teddy: No, most seashells are not yet fossils, because they have not been encased in sediment over a long period of time.

Howard: Yes! Seashells are part of something that used to be alive, so they are definitely fossils.

Teddy and Howard both had their supporters, so I did a bit of research myself. Here's one scientific response to Lindsay's question:

In order to become an actual fossil, a seashell has to undergo a process of being buried, with its original material being replaced by minerals over a period of many years. 

Most seashells that can be found on the beach have not been buried for many years, so they are not fossils.

Also today, we examined a stone tool and discussed whether it is a fossil or an artifact. I absolutely loved Hannah and Zach's theory that the tool is actually a fossifact, since it was made and used by humans but also consists of very old animal and plant remains.

Finally, Evan and his classmates correctly identified the warrior helmet as a good old-fashioned artifact.