Monday, July 24, 2023

"Off the coast of Florida, archaeologists are finding ancient sites hidden beneath the waves, tucked into the state’s sunken continental shelf".

Readers who have been with us a while know the seas have been rising for a very long time.

From Hakai Magazine, June 27:

Buried History

The following excerpt is from writer Laura Trethewey’s latest book, The Deepest Map: The High-Stakes Race to Chart the World’s Oceans, which tracks the global effort to map the seafloor by 2030. Trethewey has written for Hakai Magazine since 2016. For her magazine stories, Trethewey has learned how to weave baskets, salvaged fish from drying riverbeds, and waded into the mysterious world of sturgeon.

X marked the spot. We were close.

That morning, a crew of diving archaeologists boarded a boat in the town of St. Marks, Florida, and steamed out to the Gulf of Mexico. As the sun rose and the morning fog lifted, the pontoon boat followed the winding St. Marks River through the mangroves. Alligators’ eyes sank into the brackish water as the boat chugged past, noisy herons took flight. On our right, we passed Fort San Marcos de Apalache, built by the Spanish in the 17th century at the confluence of the St. Marks and Wakulla Rivers. Over the centuries, the fort was burned, rebuilt, looted by pirates, occupied by the British, retaken by the Spanish, and later seized by Andrew Jackson, the seventh president of the United States. What had once been a commanding fortress, hurricanes and history had eroded into an overgrown spit of jungle lined by boulders. Here and there, tall copses of pines and pond cypresses rose above the swamp; each one was likely an archaeological site with an oyster midden hidden at its base. This is the “real” Florida, as locals here in the Big Bend like to say, far from the glitz and glamor of Miami but rich in history.

I first met the archaeologists in the summer of 2021. Shawn Joy, with Florida’s Department of Historical Resources, and his collaborator Morgan Smith, an assistant professor at the University of Tennessee at Chattanooga, had just finished mapping portions of Florida’s Apalachee Bay in the Gulf of Mexico, where they turned up nearly two dozen potential sites from the Late Archaic period (5,000 to 2,500 years ago).

Archaeology under the water typically turns people’s thoughts to shipwrecks. But Joy and Smith are doing something much more difficult: searching for and locating precontact sites buried on Florida’s sunken continental shelf.

The archaeologists find it hard to communicate just how much history is still out there buried on the continental shelf. Around 40 percent of the world’s population today lives within 100 kilometers of a coastline. In Florida, that statistic is nearly double, with 76 percent of its population, or around 15 million people, living by the coast. Throughout antiquity, people have always been drawn to water, whether a river, a sinkhole, or a coastline. “Put people on the coast, and watch the life just rev up: hunting, gathering, art, culture …” said Joy. “Get people inland, and it’s like, Well, shit, how am I going to live today?” He gave a rough Neanderthal shrug. If even a fraction of early Floridians liked the ocean as much as present-day ones do, there’s a whole world of human history waiting there to be uncovered. And the farther offshore you go, the farther back in time you travel.

Up ahead, a postcard-perfect white lighthouse announced our entry into the Apalachee Bay. It was a calm day on the Gulf, not a ripple brushing the flat, limpid surface. Two weeks earlier, Joy and Smith had spent all night here on Joy’s sailboat, running a sub-bottom profiler—a sonar similar to the one I had heard quacking against the steel hull of the E/V Nautilus—back and forth over the bottom. They had “mowed the lawn” that night, going back and forth, back and forth in search of underwater sites. The sites they had found, 18 in all, were sprinkled across Joy’s GPS screen as he steered the boat. Over the coming days, we were hoping to dive them all.....


And a repost from May 2021:
"Global Warming, It’s Always a Shore Thing"
Cute title. I was going to try to get even cuter with "On this day in history, Jericho founded 9600 B.C.", the joke being that no one knows when/what day Jericho was founded, just that it's been around for a long, long time.
As a joke it is not all that funny. Sorry.
From Australia's Quadrant Magazine:

The history of all hitherto existing society is the history of global warming.

Biologically speaking, human beings may have emerged 200,000 years ago. Geographically speaking, they apparently spread to cover the entire Old World of Afro-Eurasia some 50,000 years ago. But socially speaking, our paleolithic progenitors didn’t amount to much. It may have taken a dozen ancient hunters working together to bring down a woolly mammoth, but you don’t have to be very social to organise a hunt. Just ask the English.

You can only hunt and gather your way so far down the road to civilisation, and that’s not very far. Meaningful human society only becomes possible when people put down roots and put up walls. The anthropology profession may not like to hear that, but Bruce Pascoe gets it. You can’t claim native title to “no fixed address”.

The earliest known permanent human settlement is Jericho, whose own walls famously fell to the blows of rams’ horns. The first village at Jericho is believed to date from around 9600 BC. It’s probably no coincidence that 9600 BC is also the conventional date given for the end of the last Ice Age. As the glaciers retreated, the truly big game got scarce, and people switched from hunting mammoth to herding sheep. Sheep’s wool turned out to be much more spinnable than mammoth wool, mothers starting knitting baby boots, and the rest is, well, history.

It is just possible that human society got its start in Jericho, smack in the middle of the land that God would later promise to Abraham and Moses. (God may be “infinite, eternal, and unchangeable in his being, wisdom, power, holiness, justice, goodness, and truth”, but no one ever said He was fair.) Soon after the death of Moses, Joshua led the ancient Israelites into Canaan, and Jericho was the first city to go. The Israelites “utterly destroyed all that was in the city, both man and woman, young and old, and ox, and sheep, and ass, with the edge of the sword”. Joshua went on to flatten Ai, Makkedah, Libnah, Lachish, Eglon, Debir and Hazor, but it’s Jericho that gets all the press.

Jericho lies 850 feet below sea level, but it is a mere forty miles from the sea. If it weren’t for the intervening hills, it would be completely swamped by water from the Mediterranean. In fact, it has been suggested that the fabled walls of Jericho were actually flood levees. But cut off as it was from Mediterranean trade, it seems more likely that ancient Jericho was a remote desert village than a bustling desert metropolis. For the first three thousand years of its settlement, Jericho didn’t even have pottery. If Joshua really did destroy “all that was in the city”, it may have been because there wasn’t much worth keeping.

As attractive as the Holy Land is to the holy, most reasonable people prefer to live by the sea. That was even more true in the ancient world than it is today. Until the coming of the railway, moving anything overland was hard work, with the sole exception of meat on the hoof. Inland life was fine if you were a shepherd watching over your flock by night. For everyone else, the ocean was where the action was.

But where was the ocean? Back in the glory days of prehistoric Jericho, sea level was 200 feet lower than it is today. That suggests that all the best neolithic city sites are probably now resting, undiscovered, under 200 feet of water. The world map looked very different ten thousand years ago. Albion didn’t become an island until 6100 BC. The Black Sea was a blue lake until 5600 BC. When archaeologists excavate neolithic settlements that are now on dry ground, they’re uncovering the remains of the uncouth mountain folk of deep antiquity. All the truly civilised cities probably went the way of Atlantis.

Sea level rose by an average of more than three feet for every century between 9000 and 4000 BC; it’s no wonder that every ancient culture has a flood story. The Bible’s flood story doesn’t say exactly where Noah lived, but the Epic of Gilgamesh gives a similar account of “the” flood, and Gilgamesh was the king of Uruk in what is now southern Iraq. He seems to have reigned around 2700 BC. Gilgamesh got the story from an old man named Utnapishtim who claimed to have actually lived through the flood. Fortunately for him (but unfortunately for us), Utnapishtim was immortal, so the fact that he was still alive to tell the story in 2700 BC doesn’t do much to fix the exact date.

Noah’s descendant Abraham washed up in Ur sometime around 2000 BC. Ur was then on the shore of what is now the Persian Gulf, some fifty miles to the south-east of Uruk. Abraham would have heard the flood story first-hand from his great-great-great-great-great-great-great grandfather Shem, who lived to be 500 years old. Shem was a young man of ninety-eight when his father Noah rounded up his family and loaded them on the ark. That places the biblical flood sometime around 2400 BC, more than two centuries after the reign of Gilgamesh. Maybe it was a different flood.

Either way, it seems a safe bet that amidst all the floods of the neolithic Middle East, “the” flood took place somewhere around the Persian Gulf. The flood story may be an almost historical memory of a catastrophic tidal wave that hit Mesopotamia in the 2000s BC. That’s the romantic view. Or it might be a much dimmer memory of the slowly rising sea levels that submerged some of the primest real estate of the neolithic world way back between the 8000s and 6000s BC.

The oldest known city site in Mesopotamia, Eridu, dates from 5400 BC and is just a few miles from Ur—that is, the ancient coastline. Ironically, despite the ensuing rise in sea level, Ur and Eridu are now stranded some 150 miles inland. Salt water initially inundated the flat, marshy plains of southern Mesopotamia, but then sediment from the Tigris-Euphrates river system built the land back up again. The net result is that any earlier cities that might once have dotted the shores of the ancient Persian Gulf would now lie 150 feet under the muds of Basra....


Bring on the scuba-diving antiquarians/archaeologists/treasure hunters. 

It is easy to forget just how long some of these places have been around. And how in geological terms it's all just the blink of an eye.