According to this document when Person Accounts is enabled for the Salesforce Org, there should be new fields added to the Account object (PersonMailingCountry, PersonMailingCity, etc.). However, when I go to the Page Layout section for the Person Account record type, I can't find these fields to add to the layout. Also, when I go to the Fields section under Setup->Account->Fields, I do not see any of the new fields that should be added. However, if I perform execute the following code
Account.SObjectType.getDescribe().fields.getMap() I see the new fields being returned.
Is there a reason why I cannot see these fields in the UI, but I can view them through Apex?