3. Ordinary teaching on faith and morals -> Faithful are to adhere to these with religious assent (which is different from the assent of Faith (assensus fidei) of #1 and #2) (This is where the merely Ordinary Magisterium is)
4. Ordinary prudential teachings on disciplinary matters ->These include routine publications of the various organs of the Holy See or the dioceses. These may differ according to circuмstances of time and place. An external assent is due to the teachings of this category but the possibility of error entering into this level of teaching is stronger than with #3. (This is probably where Pius XII Allocution to Midwives is)
Sounds very post Vatican IIish....
What are your sources/references for these types of magisterial teachings?
This is all codified in the Code of Canon Law and in the Holy See's standard Profession of Faith made by the Congregation for the Doctrine of the Faith. Don't be so ready to dismiss it
just because it does not have a "magic" date pre- 1962. Please don't fall into that error of "
fiftiesim" so common in traditionalists that if something is not dated before Vatican II is necessarily bad or vice-versa. It prevents you from forming an objective discernment. The Church did not defect overnight. If you have a real objection to it, you can read the full docuмent here and also in the Doctrinal Commentary on the Concluding Formula of the Professio Fidei, and we can discuss your objections.
http://www.vatican.va/roman_curia/congregations/cfaith/docuмents/rc_con_cfaith_doc_1998_professio-fidei_en.html
The relevant Canons are 750, 598, 1436.
If you notice, there are three types of magisterial statement and three different levels of authoritative teaching. The four category does not appear there, but there are theologians who have identified that 4 category. If you are interested, you can read more about this 4th category here:
Richard R. Gaillardetz, Teaching With Authority: A Theology of the Magisterium in the Church, Theology and Life Series.