It's a seek because you have a SARGable predicate (Col1 > 60 ) on a column that is the leading column of the index.
Scan is when you have nothing to seek on and SQL has to read the entire index or table. In this case, there is something to seek on.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability