Bioturbation-influenced porosity enhances horizontal fluid flow in the Trinity aquifer.

Porosity and permeability of carbonate sediments in the Trinity aquifer are low.

Transmissive units contain well-developed Thalassinoides networks with ii3–4.

Extensive bioturbation homogenizes sediment and reduces permeability.

Solution enhancement of Thalassinoides further facilitates fluid flow and karstic development.