Evolution, Civil War history entwine in plant fossil with a tragic past

Fossils are usually not thought of as a something found or even searched for in this area; at least not specimens from 115-to-125 million years ago. Typically, those searching for antique objects find relics that date to the Civil War or the Colonial period.

But according to the University of Maryland, “A fossil leaf fragment collected decades ago on [the Dutch Gap] canal bank has been identified as one of North America’s oldest flowering plants, a 115- to 125-million-year-old species new to science.

“The fossil find, an ancient relative of today’s bleeding hearts, poses a new puzzle in the study of plant evolution: did Earth’s dominant group of flowering plants evolve along with its distinctive pollen? Or did the pollen come later?”

Those searching for Civil War relics have much in common with the fossil found by the  University of Maryland doctoral student Nathan Jud, a paleobotanist – an expert in plant fossils and their environments

The find is part of local history: the history of the Dutch Gap canal dug by freed slaves who left the canal unfinished when General Butler and his troops left Bermuda at the end of the war. Jud said the digging of the canal is reminiscent of the “movie ‘Twelve Years a Slave,’ but with a twist. In 1864 Union Army troops forced a group of freed slaves into involuntary labor. The captive men’s shovels exposed the oldest flowering plant fossil beds in North America, where the new plant species was ultimately found.

Jud “identified the species and its significance. [He] named it Potomacapnos apeleutheron - Potomacapnos for the Potomac River region where it was found, and apeleutheron, the Greek word for freedmen. A paper describing the new species was published in the December 2013 issue of the American Journal of Botany.”

According to Jud, he “is studying the change that began 140 million years ago in the Early Cretaceous period, when plant communities of ferns gave way to a world dominated by flowering plants. In December 2011 he was at the Smithsonian Institution, where he is a pre-doctoral fellow, looking through clay-encrusted fossil ferns from Dutch Gap. Jud spotted one tiny leaf tip that seemed different.

A technician scraped away clay to reveal compound leaves, which placed the specimen in the flowering plant group known as eudicots. Today most flowering plants are eudicots, but they were rare in the Early Cretaceous. Potomacapnos apeleutheron is the first North American eudicot ever found among geologic deposits 115 to 125 million years old.

“Jud consulted paleobotanist Leo J. Hickey, who collected the leaf fossil at Dutch Gap in 1974. Hickey, a former director of Yale’s Peabody Museum of Natural History, agreed the plant is an early eudicot”

But the pleobotanists were puzzled because there was not pollen like a other eudicots.

“Either the plant was very rare, and we just missed its pollen,” Jud says, “or it’s possible that eudicot leaves evolved before (three-pored) pollen did.”

Hickey was excited that the Dutch Gap find might shed light on a crucial stage in flowering plant evolution. He became a co-author of Jud’s research paper, but he died of cancer in February 2013, before the paper could be published in American Journal of Botany.

“It was Hickey who told Jud the history of the Dutch Gap site, where Union generals trying to capture Richmond in 1864 thought the canal would be a strategic shortcut. Hickey knew the black laborers who dug the canal were forced to work against their will, though most modern histories don’t say so.

Jud turned to Steven Miller, co-editor of the University of Maryland’s Freedmen and Southern Society Project, where researchers analyze 2 million documents about former slaves’ passage from bondage to freedom. Miller unearthed a protest letter from 45 impressed freedmen to the command of Union Gen. Benjamin Butler.

The men wrote that they were taken to Dutch Gap “at the point of the bayonet” and forced to dig for weeks without pay. When more laborers were needed “guards were then sent … to take up every man that could be found indiscriminately young and old sick and well. the soldiers broke into the colored people’s houses taken sick men out of bed … “ A Union lieutenant endorsed the letter, writing that the men “were brought away by force” and were suffering greatly.

“After visiting the site, where cobblestones top heavy clay, Jud decided to commemorate the freedmen’s “horrific” suffering in the fossil’s name. “The reason you can dig fossils there is because of what they went through,” he says. “I thought that instead of naming it after another scientist, I should name it after the people who made this discovery possible,” According to materials provided by University of Maryland.

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