This guide has been created and updated as of 01/6/2020 and will be updated as more markings are added in game. The markings have been separated into 3 categories; Over, Under, and Separate/stand alone. They are all listed in alphabetical order as well for ease of access!
Check out the 'sister' thread for breed only marks! The linked thread has all breed only marks listed by color!
Maneater and celestial marks have been added!
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Raffle Marks(Tier 2)

Raffle marks are obtainable via RMA, Breeding, and the Weekly Raffle Lionesses. They are the "BO" or Breed only marks.
A few other marks that are considered 'breed only' are the celestial raffle markings(July event) and the Maneater markings(August event). I have added them to this list despite being Tier 3+

OVER Marks

Marks that are usually on the back, sides, face, etc. of the lion.

UNDER Marks

Marks that are usually on the paws, legs, underbelly etc. of the lion.

Separate marks

Marks that have only 1 or 2 colors in their given categories.

Event specific marks

Markings that, as stated above are event raffle only and only obtainable via breeding or RMA

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Rosettes (Tier 4)

Rosettes are obtainable via RMA, Breeding(Low pass rates), and have a small chance of appearing on a random lion upon birth regardless of if either parent has a rosette. Not much is known about Rosettes and their mysterious origins. Classic, Heavy, Soft, and Inverted rosettes will be listed here. If you want to guarantee a rosette's passing from parent to cub, you have to use an ochre gnawrock on the specific lion you wish to pass the mark from.
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Classic Rosettes

First rosettes in game before the introduction of Soft and Heavy.

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Heavy and Soft Rosettes

Introduced together in early 2018, they act like classic rosettes, but have separate appearances.