About the Park

Open to the Public

Located in Laurel, Maryland, Dinosaur Park preserves one of the most important dinosaur fossil sites east of the Mississippi River. Visitors can explore a garden of Cretaceous-era plants and view interpretive signs which describe Maryland’s dinosaurs, the prehistoric environment, and the African American history of the area.

The garden area and interpretive signs can be visited from dawn to dusk, seven days a week. The fenced fossil site is accessible during free Open Houses from 12 to 4 pm on the first and third Saturdays of each month. For more information, please call the M-NCPPC Archaeology Office at

md state dinosaur

Important Notes

• The fenced-in fossil area is only accessible during Open House hours or by appointment. No unsupervised access to the fossil site is permitted.

• No personal fossil collecting is allowed in the Park. Digging or removal of any fossils is prohibited.

• There is a portable toilet on-site, but no permanent restrooms.

• There is a small picnic area, but no water or other amenities in the park.

• Limited parking is available on-site and is reserved for visitors with special needs. Parking is plentiful along Mid Atlantic Boulevard, a short walk from the Dinosaur Park entrance.


The mission of Dinosaur Park is to preserve, protect, and interpret paleontological resources via research and management of fossil deposits, and to provide hands-on public programs for the benefit of the citizens of Maryland.

Park History

Although dinosaur discoveries are often associated with the western United States, significant fossils of dinosaurs and other prehistoric animals are also known from the east coast. In the 1800s and early 1900s, the Arundel clays in Prince George’s County were mined for siderite, or iron ore. Iron furnaces located throughout the region melted down siderite to produce iron used in construction and manufacturing. In 1858, African American miners working in open pit mines were the first to discover dinosaur fossils in Maryland.

The group of advanced prehistoric reptiles known as dinosaurs was first recognized in 1842 by British anatomist Richard Owen based on very fragmentary fossils found in England. However, it was not until more complete dinosaur fossils were found in the United States, including in Prince George’s County, that scientists were able to reconstruct the true life appearance and diversity of these extinct animals.

Among the first scientists to explore the Muirkirk deposit in Prince George’s County was geologist Phillip Thomas Tyson. He brought some of the strange bones discovered in the iron mines to a meeting of the Maryland Academy of Sciences in 1859, where his colleagues identified them as dinosaurs. Famous 19th-century paleontologist Othneil Charles Marsh of Yale University was also interested in Maryland fossils. In the winter of 1887, he sent fossil collector John Bell Hatcher to search the iron mines. Hatcher recovered hundreds of fossils, including the remains of ancient turtles, crocodiles, and several dinosaur species. Fossil collecting at the Muirkirk deposit essentially stopped when the iron industry died out in the early twentieth century, but it was revived in the 1980s by paleontologists Peter Kranz and Tom Lipka.

Fossil discoveries continue to happen at Dinosaur Park today. Since October 2009, the Maryland-National Capital Park and Planning Commission has protected the site from development and unrestricted collecting. Dinosaur Park serves as an outdoor laboratory where the public can work alongside paleontologists to help uncover the past. Hundreds of fossils discovered by visitors have been collected and cataloged to date, enhancing our knowledge about the ancient ecosystem that once existed here. Perhaps, you will make an important discovery on your next visit!