landscapers put down black dirt on top off weeds before sodding. Is this right?

Landscapers started putting our lawn in today. It had lots of and very long weeds, wild grasses and wildflowers growing. They spread out black dirt over the entire lawn without doing anything to the weeds, just left them there as is. They are then going to sod over the black dirt. Is this a dissaster waiting to happen? Thanks in advance:)

I’m not that certain, but maybe the dirt and sod will kill out the weed. If it can’t get light then it is likely to die. However, it does sound like the lazy way to sod. Most often sod is layed on clean and freshly tilled soil.
You are paying the landscapers so talk to them about it and make sure they are doing it right and not cutting corners.

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