Early 19th century; earliest use found in John Pinkerton (1758–1826), historian and poet. From stratum + -form + -ed, perhaps after French stratiforme stratiform.
Definition of stratiformed in US English:
stratiformed
adjectiveˈstratɪfɔːmd
Geology rare
Consisting of or forming a layer or layers.
Origin
Early 19th century; earliest use found in John Pinkerton (1758–1826), historian and poet. From stratum + -form + -ed, perhaps after French stratiforme stratiform.