Antler mountains as islands. Franklin Highlands in Arctic. Alleghian orogeny with Gondwana starts, re-uplifting Appalachians. The convergent suture zone runs roughly southeast through southern Georgia. All orogenic belts as Central Pangean Mountains.
Forests expand into the dryer, cooler regions.
Western subduction again brings volcanic arcs on margin of US, where Sonoma orogeny spreads upward to BC as Cassiar orogeny continuing through Triassic. Zuni transgression sequence starts. Series of faulted troughs develop Nova Scotia to North Carolina from pre-rifting tensions. Rifts develop from separate domes creating three legged rift faults that join each other. Reactivation of earlier strike- slip faults.