You have good glasses :-) Defaults are RAM, ROM, those will linker use with preference for data and code. RAM1, RAM2, RAM3 ... are additional blocks of ram, that have blackholes between them (they are not linearly connected). 

RAM1 is  first block of additional available RAM. For the semantics, yes, the ROM1 is missing, and current ROM2 must be renamed to ROM1 to follow the rule.