can i abstract to a base class then override to a generic class?

Hi

Can i do something like this

public abstract class SomeBaseClass
{
    public abstract OtherBaseClass SomeProperty {get;set;}
}

public class SomeClass<T> : SomeBaseClass where T : OtherBaseClass 
{
    public override T SomeProperty {get;set;}
}

when i do this i get saying T doesn't match the inherited abstract member.

What i am trying to do is to have a list of SomeBaseClass which needs access to SomeProperty or doi just do IList<SomeClass<OtherBaseClass>>()