Question: How did the founders of Marietta prevent its historic mound , listed on the List of burial mounds in the United States , from being destroyed ?

text: List of burial mounds in the United States
Adena and Hopewell culture burial mounds

This is a list of notable burial mounds in the United States built by Native Americans. Burial mounds were built by many different cultural groups over a span of many thousands of years, beginning in the Late Archaic period and continuing through the Woodland period up to the time of European contact.
Mound Location Date Culture Notes
Bynum Mound and Village Site Chickasaw County , Mississippi 100 BCE to 100 CE Miller culture ( part of the Hopewell tradition ) A Middle Woodland period archaeological site located near Houston , Mississippi . The complex of six conical shaped mounds was in use during the Miller 1 and Miller 2 phases of the Miller culture . and was built between 100 BCE and 100 CE . It was listed on the National Register of Historic Places in 1989 as part of the Natchez Trace Parkway at milepost 232.4
Carl Potter Mound Champaign County , Ohio ? ? Also known as the Hodge Mound II , it is located in southern Champaign County , Ohio near Mechanicsburg , it lies on a small ridge in a pasture field in southeastern Union Township
Conus Marietta Earthworks , Marietta , Ohio 100 BCE to 500 CE Adena culture The conical Great Mound at Mound Cemetery is part of a mound complex known as the Marietta Earthworks , which includes the nearby Quadranaou and Capitolium platform mounds , the Sacra Via walled mounds ( largely destroyed in 1882 ) , and three enclosures
Criel Mound South Charleston , West Virginia 250 to 150 BCE Adena culture Located in South Charleston , West Virginia , the mound lies equidistant between two sacred circles , earthwork enclosures each 556 feet ( 169 m ) in diameter . It was originally 33 feet ( 10 m ) high and 173 feet ( 53 m ) in diameter at the base , making it the second-largest such burial mound in the state
Crooks Mound La Salle Parish , Louisiana 100 BCE to 400 CE Early Marksville culture A large Marksville culture mound site in La Salle Parish in south central Louisiana . It is a large conical mound that was part of at least six episodes of burials . It measured about 16 ft high ( 4.9 m ) and 85 ft wide ( 26 m ) . It contained roughly 1,150 remains that were placed however they were able to be fit into the structure of the mound . Sometimes body parts were removed in order to achieve that goal . Archaeologists think it was a holding house for the area that was emptied periodically in order to achieve this type of setup
Dunns Pond Mound Logan County , Ohio ca . 300 to 500 CE Ohio Hopewell culture Located in northeastern Ohio near Huntsville , it lies along the southeastern corner of Indian Lake in Washington Township . In 1974 , the mound was listed on the National Register of Historic Places as a potential archeological site , with much of its significance deriving from its use as a burial site for as much as nine centuries
Grave Creek Mound Moundsville , West Virginia 250 to 150 BCE Adena culture At 69 feet ( 21 m ) high and 295 feet ( 90 m ) in diameter , the Grave Creek Mound is the largest conical type burial mound in the United States . In 1838 , much of the archaeological evidence in this mound was destroyed when several non-archaeologists tunneled into the mound . To gain entrance to the mound , two shafts , one vertical and one horizontal were created . This led to the most significant discovery of two burial vaults
Grand Gulf Mound Claiborne County , Mississippi 50 to 150 CE Marksville culture An Early Marksville culture site located near Port Gibson in Claiborne County , Mississippi , on a bluff 1 mile ( 1.6 km ) east of the Mississippi River , 2 miles ( 3.2 km ) north of the mouth of the Big Black River . The site has an extant burial mound , and may have possibly had two others in the past . The site is believed to have been occupied from 50 to 200 CE
Indian Mounds Regional Park Saint Paul , Minnesota 1 to 500 CE Hopewell and Dakota cultures Originally up to 37 mounds constructed , 6 still in existence
Miamisburg Mound Miamisburg , Ohio 800 BCE to 100 CE Adena culture The largest conical mound in the state of Ohio , constructed by the Adena culture on a 100-foot-high bluff , the mound measures 877 feet ( 267 m ) in circumference and its height is 65 feet ( 20 m )
Mound City Chillicothe , Ohio 200 BCE to 500 CE Ohio Hopewell culture Located on Ohio Highway 104 approximately four miles north of Chillicothe along the Scioto River , it is a group of 23 earthen mounds . Each mound within the Mound City Group covered the remains of a charnel house . After the Hopewell people cremated the dead , they burned the charnel house . They constructed a mound over the remains . They also placed artifacts , such as copper figures , mica , arrowheads , shells , and pipes in the mounds
Pinson Mounds Mounds 6 , 12 , and 31 Madison County , Tennessee 100 to 300 CE Miller culture A mound complex which includes mounds , a geometric enclosure , and numerous habitation areas , it is the largest group of Middle Woodland mounds in the United States . The complex covers approximately 400 acres ( 1.6 km ) and contains at least 30 mounds , 17 of which have been identified as being completely or partially constructed by prehistoric peoples . It includes at least 3 burial mounds , and a number of ceremonial platform mounds
Reservoir Stone Mound Licking County , Ohio AD 85 to 135 Probably Adena culture Also known as the Jacksontown Stone Mound , the central , stone-covered structure was largely destroyed by the removal of stones to construct the Licking Reservoir and by a 19th-century treasure-hunter . Around the edge of the large stone mound were a number of earthen mounds , some of which contained burials