The practice of locating natural gas and petroleum deposits has been transformed dramatically in the last 20 years with the advent of extremely advanced, ingenious technology. In the early days of the industry, the only way of locating underground petroleum and natural gas deposits was to search for surface evidence of these underground formations.
Thumb Safety. No, the problem with a Thumb Safety is it's a Minor Motor Skill the way your brain see's it. Under a stressful situation you may loose all minor motor skills. All my guns I train with and I train consistantly, do not have any safeties.
The thumb. noun. The thumb is the short finger on your hand that is nearest your wrist. The short finger on your hand that is opposable to your other fingers is an example of a thumb. To thumb is to use the short finger of your hand to touch something or to turn the pages of a book. When you turn the pages of a book using the short finger on your hand, this is an example of a time when you thumb through the book.