"Organic" lawn care company: "humic shale"

Searching for a company that does natural lawn care in my area.  A company says they feed with products derived from "humic shale" which they describe as 75 million year-old decomposed matter drawn from the earth.  Isn't this the definition of Fossil Fuel/petroleum?

Hi, Monica Welcome to permies.

If you will give the location where you are looking for a lawn care company it will better assist our members in helping you.

Southeast Michigan.  I contacted the company with the shale and they said shale is shallower than petroleum and a different beast, can't be ignited is safe for humans, pets etc.  

Our soil is "Conover Clay".  

Those humic products, though widely marketed to people concerned about "organic" fertilization, have been pretty resoundlingly debunked from an effectiveness standpoint:

Humic Substances Generally Ineffective in Improving Vegetable Crop Nutrient Uptake or Productivity

Ah - so ineffective, and not exactly organic.