==== Leaf shaped heads ====
'''Thålin Group 1'''<br>
Leaf shaped heads, Petersen types A(B), C(D1) and E, seem to go out of fashion by 950AD [PETERSEN 1919]. Other people have suggested that a few leaf shaped heads may have continued throughout the period [*Citation Needed].
==== Angular shaped heads with Short Sockets====
'''Thålin Group 2'''<br>
Group 2 consists of Petersen types D:2, G and H. They are all types with edge shoulders placed low on the blade and a short conical socket with marked narrowing below the blade.<br>
Fuglesang includes the winged spears of Petersens type D2 in with this group as he removed wings as a determinant of typology making Petersens D2 and G types the same. See the section on ‘Winged Spears’ for examples of D2 style spear heads.<br>
====Angular Spearheads with Long Sockets ====
'''Thålin Group 3'''<br>
Group 3 consists of Petersen types F, I, K & M. They are all types with a narrow blade which is often shouldered and a socket that is long, narrow and conical.<br>