There's been less than 150 miles of Mars roamed by mostly small rovers that often could barely do more than take pictures and do some basic soil chemical analys

There's been less than 150 miles of Mars roamed by mostly small rovers that often could barely do more than take pictures and do some basic soil chemical analysis. Do you expect to see obvious dinosaur remains with an RC car with a small shovel driving around in Kansas for 100 miles, especially if you don't even know what a dino even looks like?