Middle Devonian faunas from the eastern United States have been well studied for over a century. Many analyses have been done on stratigraphic units of the Appalachian Basin (e.g., Columbus Limestone in Ohio and Onondaga Limestone in New York) and Michigan Basin (e.g., Silica Formation in Ohio). However, the early Middle Devonian Dundee Formation of the Michigan Basin has not been studied in detail. This thesis provides paleontological and lithological data in order to interpret the paleoecology and paleoenvironment for the Dundee Formation. In particular, a comparison of marine invertebrate community composition between the Dundee Formation carbonates and the slightly younger siliciclastic Silica Formation was performed, and the faunas in the different layers in the Dundee were compared to each other to see if ecological changes occurred through time. The Dundee Formation is well exposed at the Whitehouse Quarry in Lucas County, Ohio. Hand samples and thin sections tied to five measured sections from the quarry provide a context for interpreting both lithological and paleontological data. The Dundee Formation consists of two members, the (lower) Reed City Member, and the (upper) Rogers City Member. The Reed City Member shows a shallowing-upward trend through typical shallow subtidal carbonate wackestones and packstones, with storm deposits becoming more frequent towards the top of the exposed section. Much of the Dundee Formation appears to have been bioturbated, with Thalassinoides-type burrows most common, indicating firmground but not hardground substrates. The top of the section shows a pronounced change from wavy-bedded tempestites to fine-grained nodular deep-water limestones. These nodular limestones represent the first documented occurrence of the Rogers City Member of the Dundee Formation in Ohio. The Rogers City Member is overlain by harder, more massive, bluer beds with large colonial rugose and tabulate corals and stromatoporoids. This colonial coral assemblage resembles that from the Columbus Limestone exposed at Marblehead Quarry, Ottawa County, Ohio. Nineteen 40-cm x 40-cm rock slab samples were taken from eight stratigraphic horizons at the Whitehouse, Ohio, quarry. Fossil taxa found within a randomly placed 20-cm x 20-cm grid on the slab were identified and counted. Dominant taxa include brachiopods, tentaculitids, and rugose corals; fish bones, bivalves, and rostroconchs are common in some horizons. Five distinct faunal assemblages succeed each other upsection, three within the Reed City Member, one within the Rogers City Member, and one within the Blue Limestone. These communities have similar taxonomic compositions, but with varying abundances. For instance, Strophodonta demissa, Mucrospirifer mucronatus, and Pseudoatrypa cf. P. devoniana are least abundant in the deep-water environment of the Rogers City Member, while Rhipidomella vanuxemi drops in abundance through time. Tentaculites scalariformis and Tropidoleptus carinatus (both fairly small) seem to increase in abundance when there is less dolomite content. Overall, these trends show that when sea level was at its highest, during the deposition of the Rogers City Member, many of the common Dundee species were either not present or had lower than normal abundances. Dolomitization may have hindered the preservation of the smaller fossil organisms. The Silica Formation fauna was found to be much more diverse than that of the Dundee Formation (70 versus 129 genera). Of 70 genera known from the Dundee Formation, only 21 (30%) persist into the Silica Formation, and only 16 of 112 species (14%) are present in both units.