I'd rather see how he thinks this single layer of sedimentary rock covers a large portion of the globe.
The simple answer is Noah's Flood.
The Bible theory Scripture specifies that the time elapsed for all of creation and earth history has not been very long. Our geology confirms it.
And no green font.
Noah's Flood?
First of all, that a sedimentary layer is covering most of the globe (oceans included) has not been shown.
Second of all, if it exists and depending on where the layer is in the strata, it would offer as much proof of a long wet period in geological time.
The global flood is
historical.
"The Flood of Noah’s day (2348 BC) was a year-long global catastrophe that destroyed the pre-Flood world, reshaped the continents, buried billions of creatures, and laid down the rock layers. It was God’s judgment on man’s wickedness and only eight righteous people, and representatives of every kind of land animal, were spared aboard the Ark."
The Flood
Would that not change the geology of the Earth and in rapid fashion?
That said, why was it covered up with a story that it was all myths? However, we find that these myths are found throughout the world. No local flood, even a large regional one, would do that.
One can only lead a horse to water, but not make them drink. I suppose they can run him around the track until he's thirsty, but you can't do that with humans. The big lie covers up the truth. Not vice versa. Shrug.