| Mifflintown Formation | |
| Type: | Formation |
| Age: | Silurian |
| Region: | Maryland, Pennsylvania, and Virginia |
| Country: | United States |
| Underlies: | Bloomsburg Formation |
| Overlies: | Keefer Formation |
The Mifflintown Formation is a geologic formation in Maryland, Pennsylvania, and Virginia. It preserves fossils dating back to the Silurian period. The type location is near Mifflintown, Pennsylvania.[1]