This pattern is for a fossil ammonite. If you follow the instructions and use 4ply wool and 2.5 mm needles, you will need approx 5g of wool to make your own ammonite.
You needle doublepoint needles, as there is a little bit of icord knitting, and then to get the curve I use short rows. I explain in the notes how to do this.
Have fun making your own collection of fossils.