We were given this (see video) present from my good friend Heinz Strobel whom I have lost touch since the early 1990s. He is a lovely man who lived by himself in Balingen Germany very near to the Black Forest separating Germany and France.
My wife and I went to visit him in 1993 during our honeymoon, and I will one day post those wonderful pictures of us, cycling and walking in the Black Forest. Heinz had a dark green Wolkswagen (people's car) and it came with a convertible roof so we had lots of fun posing with the car and Heinz.
He gave May and I this and I have always wondered what this was. I managed to find out only today, as Microsoft Bing decided to show this on their wallpaper these few days.
This, my readers and friends is an ammonite fossil, from the (drumroll) Jurassic Period.
They are an extinct group of marine mollusk animals closely related to modern day octopusses,squids and cuttlefish.
Their most distinctive features are the tightly coiled spiral shells divided into chambers (see the rings on the video), which often display intricate beautiful patterns or suture lines, where the chamber walls meet the outer shells.
These molluscs appeared around (drum roll) 400 million years ago and went extinct alongside the dinosaurs.
Cool information huh ?

