Vent: Spent 3 seasons digging the wrong layer before a geology student pointed out my stratigraphy was upside down

Was pulling artifacts from what I thought was a lower Paleolithic horizon near the Ohio River when a kid from Ohio State told me the soil profile was inverted from a landslide and I had basically been sifting through modern trash mixed with old river gravel for 2 years has anyone else had a total rookie moment like that where you just trusted the textbooks over the actual dirt?

3 comments

3 Comments

the_leo6d ago

Used to think field guides and textbooks were basically infallible bibles for site work. Then a drought exposed a cutbank in Oklahoma that had three distinct soil layers, all totally flipped from what the book said for that region. Spent a good chunk of that field season arguing with a geologist buddy before he finally just took me to the exposed roots of a massive old cottonwood and showed me the actual natural soil sequence underneath. Completely humbled me. Now I always dig a test pit first, no matter what the map says. That student honestly did you a huge favor, even if it stings right now.

calebc406d ago

Reminds me of the time I spent a whole weekend digging holes on a site based on the county soil survey map (which I swear I could've used as a coffee table book back then). Turns out the map said "silty loam" but I hit bedrock at 18 inches. My boss at the time just laughed and told me to trust the auger, not the book. That old cottonwood root story is gold though, real talk.

phoenix_bailey6d agoMost Upvoted

Man @calebc40 hasnt your boss ever heard of the "trust but verify" rule with those old maps? Ive got a similar story - spent a whole summer following a 1940s soil survey for a restoration project and found out the hard way that the map was basically a fantasy. The "silty clay loam" it showed was actually straight gravel with a 2 inch topsoil cap. @the_leo is spot on about test pits, i learned that lesson digging 30 holes before someone finally told me to stop listening to the book and trust what i was hitting with the shovel. Those old surveys are great for bedtime reading but they sure dont dig the holes for you.