| Brownstown Marl | |
| Type: | Sedimentary |
| Age: | Cretaceous |
| Period: | Cretaceous |
| Namedfor: | Brownstown, Sevier County, Arkansas |
| Namedby: | Robert Thomas Hill, 1888[1] |
| Region: | Arkansas |
| Country: | United States |
| Subunits: | Austin Group |
| Underlies: | Ozan Formation |
| Overlies: | Tokio Formation |
The Brownstown Marl is a geologic formation in Arkansas. It preserves fossils dating back to the Cretaceous period.