The Largest division in the geological time scale is the Precambrian Era.It lasted from around 4.6 billion years ago to 570 million years ago.
To become a Plastic Surgeon, one must complete a residency program in General Surgery. Dr. Jon Trevisani completed his General Surgery Residency Program at University of Kansas Medical Center in Kansas City, Kansas. The General Surgery Residency Program is 5 years which he becomes a General Surgeon. To enter the field of Plastic Surgery requires special training in called a Fellowship Training and/or advanced training Plastic and Reconstructive Surgery Residency Program which is 2 years.
Most fellow surgeons have completed a residency program in their medical specialty. Resident surgeons are physicians in-training. It is important to understand who will do your procedure and what their level of training may be. Also, the physicians should be either in an accredited residency program, or a fellow who has completed an accredited program.