I bought a Colombian Rock from a guy in yorktown too! Im guessing its the same person . What a small world! They are about 5 weeks now and Im rrrrreally hoping to have a hen. Mine has ZERO markings. Almost no comb or waddle and NO black feathers on head neck or tail! Is that odd? I thought buy now Id see some black coming in. Ill try to post a pic tonite. Although he/she is simply all white!
Should have plenty of markings by that age. I bet you have white Rocks.