Much of the shoreline bluffs on Marrowstone Island are very abrupt, with a steep vertical drop due to the hard glacial till that can stand for decades as vertical cliffs.
https://github.com/davepinch/pinchy.cc/blob/master/content/sites/washingtonlandscape.blogspot.com/2018/07/possible-wave-cut-slope-on-marrowstone.md
A football field is often used as a comparative measurement of length when talking about distances that may be hard to comprehend when stated in terms of standard units.