Lepidodendron

Blocks:

Angiosperm organic ground

Angiosperm ground cover

Grey sand block family

Pebblestone + Mossy Pebblestone

Brown clay, brown brick

Peridotite

Megalodon bivalve accuracy tweak

Dicerocardium bivalve accuracy tweak

Gigantoproductus brachiopod accuracy tweak

Gigantocapulus

Glass sponge

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Optimized reefs

Optimized bivalves

Animated sprouting algae

Devonian: 

Wattieza

Carboniferous:

Synchysidendron

Sphenopteris fern

Seed Sphenopteris

Sturdy Sphenophyllales

Symplocopteris

Porongodendron

Dryland Cordaites

Wetland Cordaites (tweaks) 

Calathospermum

Calamopitys

Angiopteris

Archaeocalamites

Nemejcopterus

Permian:

Glossopteris duocaudata

Glossopteris ampla

Rissikia

Paracalamites

Neomariopteris

Vojnovskyales