Another major problem is the significant gap in the fossil record between the extinction of the ammonites and the earliest fossil Argonaut. Until recently a shell described as Obinautilus was thought to be the oldest such fossil at 29 million years old, which still leaves a 36 million year old gap with the most recent ammonite. However, Obinautilus has been recently re-described as a nautilus. This leaves our oldest fossil as Argonauta absyrtus from Cyprus and dating to a mere 12 million years old, and a few slightly more recent egg cases from Los Angeles, Japan and elsewhere (Mizohubaris, Izumenauta and Kapal). Of course older fossils may be out there, it just that we haven't found them yet!