What is a layer of hydrogen sulfides? Hydrogen sulfide is a gas.
And I seriously doubt that the hydrogen sulfide amount in the gas venting from that well represents any threat to us.
It’s related to the discussions of the Iridium layer — what killed the dinos: a meteor (which uniformly scattered Iridium around the earth’s crust) or a huge volcanic eruption which showered the earth in ash, darkened the skies, polluted the air and rain (with hydrogen-sulfides of various kinds) and resulted in a uniform layer of sulfide deposits around the earth.