Jennifer Pregler, it looks a lot like American Black Walnut. Here is a similar floor with an oiled finish from Rubio Monocoat.

Black Walnut Flooring for Deland Custom Home · More Info

With regard to the question, the flooring is black walnut with a custom stain to even out the colors. From the heartwood to the sapwood black walnut has strikingly different colors, with the heartwood being black and the sapwood almond. This floor was finished in three coats of an oil-based product, DuraSeal. We purchased our walnut flooring from Mark Harbold at CountryPlank flooring--CountryPalnk.com. We also buy red oak flooring from CountryPlank and are pleased with the service and quality.