This is a fossilized gastropod, or marine snail. This was a big 'ol boy too.
It came from my place, in the bottom of a post hole. It is late Cretaceous, probably 60-65 MM years old and part of a Glen Rose formation (Trinity series) reef that puked up nearby and was covered with sea water. The depth of the water was likely only 30-40 feet over the very top of the reef and as the sea was in its transgressive period, going back and forth (before it finally receded to current day Gulf of Mexico), the reef was exposed to sunlight.
Where I am the top of the reef became calcified from very high salinity levels in the sea. The over millions of years mud washed down from the north and piled up on top of the reef. Under not very much pressure, nor heat, that mud turned into…
Did the industy ever settle on a downspacing distance? I ignored the hub-bub back in the day about how much more they were going to produce from them being closer and closer together. Also love the industy using well interference instead of pressure depletion...maybe hits a little too close to home/the truth.