Thoughts on breed?

[rebrascora]

The black and white chick has a white head spot which indicates it would have been barred. This chick most likely came from the dark marans egg,

 

[oldhenlikesdogs]

I'm showing my ignorance but there were 2 eggs that hatched - one was the dark one and one was the lighter one in the back. The two chicks are shown in the top pic but the one in the front with the black and white didn't make it. I am not sure which chick came out of which egg sorry to say.

I think it's a black Orpington. Rooster. It probably came out of the lighter egg. The one in back on your first picture is probably the marans out of that dark egg.

 

[juliejohnson805]

I agree that the feathers resemble one of my Orphingtons, but I really thought this IS the chick in the back. I was also thinking roo, which is okay since I am down a roo.

 

[rebrascora]

The chick in the foreground has a white head spot, so it would have been barred and therefore more likely to have come from a paler egg. By default this chick will most likely have come from the darker egg and be a Marans or Marans cross possibly the Marans was used to make an Olive Egger if that was one of the options in the mix of eggs you purchased.