In order to establish relative dates, geologists must make an initial assumption about the way rock strata are formed. It's called the Principle of Original Horizontality, and it just means what it sounds like: that all rock layers were originally horizontal. Of course, it only applies to sedimentary rocks. Recall that sedimentary rock is composed of... sediments, which are deposited and compacted in one place over time.
Larry Nassar sentenced to 60 years in prison Gymnastics December 7, 2017 The former US Gymnastics doctor was given a 60-year sentence in federal prison on child pornography charges.
UPDATE, January 24, 2018: Larry Nassar has been sentenced to 40 to 175 years in Michigan prison by Judge Rosemarie Aquilina. You can read more about her sentencing decision here. He was previously sentenced to 60 years in federal prison on child pornography charges, and faces lawsuits from more than 100 women accusing him of sexual abuse.