Which preposition to use with earmarks

of Occurrences 18%

They were both leggy chestnuts, with surprising signs of blood' and all the earmarks of sprinters; but in Godwin's trade sharp getaways were probably often necessary.

for Occurrences 2%

If anything unusually good happens, there's an unusually good man behind it, and he ought to be earmarked for promotion; and if anything unusually bad happens, there's apt to be an unusually bad man behind that, and he's a candidate for a job with another house.

Which preposition to use with  earmarks