By Tony Cross

Greece and its geology are a wonder of nature, with the nation a paradise blessed with high mountains, blue seas, and over six thousand islands. But it’s all a big geological accident, the result of millions of years of violent earth movements on a planetary scale.

Geology in Greece: in the beginning…

The story of Greece and its geology begins around 250 million years ago when the continents had all come together into one single land mass that geologists call Pangea.

The area that would one day become Greece lay on the southern shore of what would eventually become Europe and on the northern edge of a great ocean called Tethys. On the southern edge of Tethys lay the continent that would one day become Africa.

The Earth’s crust is not all the same, nor is it a single unit. The crust making up the continents is very thick—30 km to 40 km (18.6 to 24.85 miles) thick—and thicker still under mountain ranges. The crust under the oceans is quite thin, however, at only around 7 km (4.3 miles) thick.

In addition, the crust is not one single unit but is broken up into various-sized chunks known as tectonic plates. These plates move relative to one another because they are literally floating on the deformable layer of the upper mantle beneath them in much the same way that a ship floats on the sea.

In some places, these plates are moving together, and where oceanic crust is pushed into continental crust, the thinner oceanic crust is forced beneath the thicker continental crust and down into the mantle, where it begins to sink and melt. Geologists call this type of plate boundary a subduction zone.

The Greek landscape and geology that we see today is here because of a subduction zone. Without it, Greece would simply not exist.

The compressive phase

Around 150 million years ago, the great continent of Pangea started to break up. The African plate began to move northwards, and the Tethys Ocean started to shrink. The northwards movement of Africa meant that the oceanic crust beneath Tethys was subducted under the southern edge of the continental crust of Europe.

As the oceanic crust under Tethys slid beneath the continental crust of Europe, all of the rocks that had formed on the ocean floor over many millions of years were scraped off by the leading edge of the European continent. These rock scrapings, which would have been hundreds of meters thick and many kilometers long, were piled up one on top of the other on the southern edge of Europe.

This rock pile (geologists call it a nappe) was likely many kilometers thick in the end. It contained all the rocks that would eventually form Greece’s geology all piled up in the same place.

The photo shown here is of a large sea cliff near Kavousi on Crete. The rocks on the left are a gray color with clearly defined horizontal layers. Those on the right are a greenish brown color with a nearly vertical layering. Clearly, this cliff is composed of two very different rock types.

The rocks on the left are limestones while those on the right are phyllites. The compressional forces of the subduction zone forced the phyllites over and on top of the limestones. The junction between the two (known as a thrust fault) lies roughly in the center of the picture, running diagonally up from right to left.

Millions of years of weathering and erosion have ground both sets of rocks down so that to the casual observer today, they appear to be a single unit.

The tensional phase

Around 65 million years ago, the continent of Africa finally collided with the continent of Europe and closed the Tethys Ocean forever. It would eventually be reborn as the Mediterranean Sea.

When two continental plates come together, there is no subduction since they are both too thick. Instead, the continents themselves are deformed, and mountains are created. In the west, this collision formed the Alpine mountains while in it formed the Balkan mountains in the east.

In these mountain areas, the continental collision destroyed the subduction zone, but in the area in between, where modern Greece lies, the subduction zone remained active.

Even though Africa could no longer move northwards as fast as was previously the case, the oceanic plate in the area of Greece was still sinking into the mantle. As it sank, the subduction zone itself rolled back southwards. This rollback of the subduction zone put the nappe pile under enormous tension.

When rocks are placed under tension, they break, causing normal faults. One side of the fault moves downwards on a sloping surface to relieve the tension. Normal faults often occur in parallel and in swarms leaving alternating areas of high ground with lower ground in between.

The rollback of the subduction zone caused massive parallel swarms of normal faults in the nappe pile. Because the subduction zone is fixed in the east and in the west, the rollback created an arc that is ever expanding as the rollback progresses.

The photo above is of a small section of the north wall of the Corinth Canal. The rocks here are nicely layered; we can see yellow, white, red, and black layers.

The two diagonal lines in these rocks are normal faults, breaks in the rocks caused by tensional forces due to the rollback of the subduction zone. The rocks to the right of each fault have dropped down relative to the rocks on the left; this is clearly visible in the displacement of the colored layers of rock.

The total vertical displacement here is only a few meters, but in the massive regional faulting that shaped Greece and its geology, displacements are measured in kilometers.

The modern topography of Greece

Looking at a topographical map of Greece today, you can see how a subduction zone, starting roughly in the area of the north Aegean and rolling back southwards in an expanding arc would create the “ripped” and “torn” appearance of Greece today. You can also see how regional faulting created the alternating series of high mountain ranges and islands, with lower plains or sea in between.

The Pindus Mountains, for example, the backbone of mainland Greece, run southeastward in a gently curving arc. On both sides are lower plains. These mountains, like so many others in Greece, are bounded by massive regional faults.

The expanding arc of the subduction zone caused extensive local faulting, too. On Crete, for example, all of the mountain ranges are bounded by faults. They stand tall because the ground around them has dropped due to faulting. Such local, fault-bounded structures are widespread in Greece.

What about the volcanoes?

There are many volcanoes in Greece—on Santorini, Milos, Nisiros, Methana, and Sousaki among others. Some are active, like Santorini; most are dormant, like Milos, and one or two are extinct, like Sousaki.

If you look closely, all the Greek volcanoes sit on an arc that parallels the arc of the subduction zone but is north of it by about 100 km.

As the oceanic plate is subducted deep into the mantle, it begins to melt. Magma from the melting plate rises to the surface where it erupts, forming volcanoes.

The hot springs of Thermoplyae (of Spartan fame) sit at one end of this volcanic arc; the hot springs of Pamukkale in Turkey sit at the other. In between are all the Greek volcanoes, formed above the spot where, deep in the mantle, the subducted oceanic crust is melting.

Greece’s geology continues to change

The subduction zone today runs in a great arc down the western side of the Ionian Islands, around the Peloponnese and south of Crete, and then curves up northwards again past Kasos, Karpathos, and Rhodes.

Greece and its geology as we see these today are not an end point, however; this is simply the way things are right now.

The subduction zone is still active, and the oceanic plate is still descending as Africa creeps northward. The subduction zone is still rolling back, and the arc is still expanding. That’s why we have so many earthquakes in Greece—we’re still being torn apart by tectonic forces.

We don’t need to worry about this too much though, as these geological processes happen on a timescale that is measured in millions of years. Chances are, that beautiful Greek beach in the travel brochure will still be there when you arrive.

In a time and place that offered few career opportunities for women, the job of the priestess of Apollo at the Oracle of Delphi stands out. Her position was at the centre of one of the most powerful religious institutions of ancient Greece. The competing Greek city states had few overarching authorities (political or otherwise), so the significance of her voice should not be underestimated.

Indeed, there is some evidence to suggest that the priestess Pythia was at the core of what we today call a “knowledge economy.” Her role may well have involved the gathering, re-packaging, and distribution of information, with the ultimate intent of providing sound advice on the trivial and not-so-trivial questions of life in ancient Greece.

The “Pythia” is the official job title. We know of several women by name who, during the long history of this institution (from ca. 800 BC to AD 390/91), held that role, including Phemonoe and Aristonike. Indeed, at some stage, Delphi became so busy that three Pythias were appointed to serve in the role simultaneously.

The oracle was consulted by the movers and shakers of ancient Greece on a diverse range of problems. For the priestess Pythia, this meant the opportunity to comment on a variety of issues of public and individual concern: cult matters, warfare, the relationships between existing city-states, and the foundation of new ones.

Numerous personal questions were also put to the oracle on matters of lovesickness, career advice, childbirth, and how to get offspring. So, by all standards, this job was demanding yet also diverse and rewarding—a position powerful enough to change the course of history.

Yet, right from the beginning, efforts to deprive the priestess of her power prevailed, particularly in older classical scholarship. Surely a woman, especially one in such a paternalistic society as ancient Greece, could not hold that powerful a position?

Some scholars suggested that the Pythia actually babbled unintelligible gibberish and that her words were later put into beautiful, deep, and meaningful hexameter verse—by male priests.

Yet, in our ancient sources, there is absolutely nothing to suggest that it was anyone other than the Pythia herself who came up with the responses. On the contrary, she is regularly named as the one and only source of the prophecies delivered at the Oracle of Delphi. There is no word of male priests beyond those in purely administrative and assisting roles.

Insult by oracle

The position of the Pythia seemed to have entailed the extraordinary opportunity to speak unwelcome truth to those in power.

A Spartan once approached the oracle with the intention of being confirmed as the wisest man in the world. In response to this question, the Pythia named another person who was wiser.

In about 700 BC, the Greek city of Megara allegedly asked the Pythia which the best of all Greek cities were, hoping to be named first. The Pythia mentioned two better cities, concluding with the line, “[Y]ou, o Megarians, [are] neither third nor fourth.” Surely, the Megarians did not see that coming!

Cleisthenes, meanwhile, the famous tyrant of Sicyon, asked whether he should remove the cult of the hero Adrastus from the city. He received an oracle that came straight to the point: “Adrastus is king of Sicyon, and you but a common slayer.”

This kind of reality check and straight talk would certainly have upset those with egos accustomed to flattery and agreement.

Of course, it is not always possible to tell whether these and other responses of the oracle were authentic or whether the whole incident was part of later historiographic lore. Yet, whatever the case: the fact is that it was a woman who was attributed such a sharp, judgmental voice.

And her voice proved extraordinarily unimpeachable. The Greeks thought that it was the god Apollo who conveyed his superior divine knowledge through the mouth of the Pythia, so the priestess herself was largely beyond reproach. While itinerant seers, augurs, and oracle mongers feature in classical literature as corrupt and unreliable, the position of the Pythia seems to have withstood all criticism.

The job and its challenges

Being a Pythia was not always easy. Several ancient enquirers sought to influence the kind of answer they hoped to get from the oracle. Subtle manipulation in how the questions were put, not-so-subtle bribery, and even an attempt to force the oracle to deliver responses on a non-auspicious day are all on record, as are complaints about unfathomable responses.

For instance the Greek historian, philosopher, soldier, and horse whisperer, Xenophon, allegedly enquired at Delphi to which deity he should sacrifice and pray so that the military expedition he was about to join would be a success. He was later reprimanded by the philosopher Socrates for having posed a manipulative question. Socrates felt he should have asked whether it would be a success, rather than how.

Cleisthenes was said to have bribed the Pythia to deliver the same response to all Spartan requests at the oracle, no matter the question: to free Athens from the rule of tyrants.

And after a series of spectacular mishaps based on misread oracles, the Lydian king Croesus complained at the Delphic Oracle about having been misled. The Pythia responded that he himself was to blame for his misfortune, as he should have interpreted the Pythia’s words correctly.

We also know of several instances in which the Pythia outright refused to respond to a question that, in one way or another, seemed unreasonable.

Job requirements

What did it take to become the Pythia? Was she a local girl from a neighboring village? Was any kind of training provided to candidates? Or were they thrown in the deep end?

Unfortunately, the ancient sources are silent. The Nobel prize-winning author William Golding in his (posthumously published) last novel, The Double Tongue, written from the perspective of a Pythia, sees her as a local girl who was unable to get herself married and so took on that role.

Yet again, this sounds like speculation designed to downplay the position.

The kind of skills required to be successful in the role are easier to reconstruct. The sanctuary of Apollo at Delphi served as a marketplace for representatives from all over ancient Greece (and beyond) who came for a variety of reasons.

In addition to the oracle, the sanctuary housed regular athletic competitions (the so-called Pythian Games, analogous to the more famous Olympic Games). With its numerous temples and monuments, the site was also a popular tourist destination. All these activities together served to establish a busy hub, where information, news, and gossip of all kinds would have circulated freely.

Perhaps the key to the Pythia’s success was simply to listen closely? There is good evidence to suggest that the fantastic tales of prediction and fulfilment are a matter of the (later) historiographic tradition and that it was mostly quite straightforward questions of everyday life that were put to the Pythia for comment, along the lines suggested by the ancient author Plutarch, who was also a priest at Delphi: Will I win? Shall I marry? Is it a good idea to sail the sea? Shall I take up farming? Shall I go abroad?

If this was indeed the case, it would, more often than not, have been possible to glean the information necessary to answer any particular enquiry from the chatter of those queuing to consult the oracle, to watch or participate in the games, or to take in the monuments. The Pythia may have trailblazed the knowledge economy millennia before the arrival of “big data” and the invention of the internet.

By Julia Kindt

Julia Kindt is a Professor, Department of Classics and Ancient History, University of Sydney. The article was published at The Conversation and is republished under a Creative Commons License.

There is something about Greece that sets it apart from many other holiday destinations across the globe; its mythological sites.

Many ancient societies had different beliefs and myths, but none are more prominent in modern-day life than that of the Greeks. Their creatures have become legends, their tales inspiration for great fiction and their gods immortalized through the continued retelling of their conquests and trials.

Delos: an ancient mythological site in Greece

Matched only by the Acropolis of Athens, Greek mythological site the ruins on the island of Delos are an unmissable location for anybody interested in ancient Greek culture. One of the best-preserved examples of an ancient Greek civilization, the island is completely unblemished by modern architecture and as such, allows its visitors to delve deep into history.

However, it is not just a site of great historical importance, but a mythological one too. It was on this island that both gods Artemis and Apollo are said to have been born. As a result, the island became a sacred place. Sanctuaries and temples sprung up across its hillsides as people from across Greece came to the island’s shores to worship the deities.

The Labyrinth, a famous site in Greek mythology

One of the most famous and exciting stories of Greek mythology is the tale of Minos, Theseus and the Minotaur. Minos was a powerful king, ruler of Crete and the son of Zeus, but after he betrayed Poseidon, he was cursed to raise a son with the body of a man and the head of a bull. Using this curse to his advantage, however, Minos built the fabled Labyrinth and trapped the Minotaur within it. He would then send victims to their deaths until Theseus, prince of Athens, ventured into the Labyrinth and slayed the beast.

While there are no Minotaur bones for you to see, there are two possible Labyrinths to explore. First is the likely home of King Minos, and therefore the most plausible home for the labyrinth, Kommos. Located along the southern coast of the island, Kommos is a great place to visit, with spectacular ancient ruins and beautiful ocean views.

However, if you venture deep enough into the ruins of this ancient city, you will find many maze-like corridors and walkways that may have been the Minotaur’s home; or at least the inspiration for its tale. However, just down the road you will also find Gortyn, a site of great archaeological importance to Crete and another suspected home of the Labyrinth. Further away from Minos’ home, these ruins bear a much similar resemblance to the maze of mythology. Perhaps then, it is best to visit both Greek mythological sites and decide for yourself.

The Island of Ithaca: an ancient Greek site and holiday destination

Ithaca, a well-known Greek mythological site for a holiday destination, is a place with a very interesting mythological past. Most notably, it was home to the legendary trickster Odysseus, the island’s greatest king and the brains behind the trojan horse.

Odysseus was also the protagonist of Homer’s “Odyssey.” His decade-long struggle to return home after the war is the source of many of the most enduring Greek myths.

The famous Cave of Zeus on the Greek island of Crete

Hidden away on the island of Crete is an extraordinary piece of Greek mythological history. Within a cave beneath Mount Ida, it is said that the King of Gods, Zeus, was born and raised.

The Cave of Zeus is a beautiful location, with one entrance leading into a network of caves filled with stunning rock formations and underground pools. It does indeed seem a fitting place for the beginnings of the greatest god Greek mythology has ever known. However, it was not by choice he was raised here but by necessity.

His father, the titan Cronus, was set on devouring all of his progeny to ensure that they could never contest his power. However, unbeknownst to Cronus, Zeus’ mother, Rhea, hid him within the cave so one day he could return to overthrow his tyrannical father; which, according to legend, he did.

Mount Olympus: Home of the Greek gods

Along the eastern coast of the Greek mainland, you will find one of the most well-known natural landmarks in the world; Mount Olympus. This legendary and iconic Greek mythological site is an awe-inspiring sight, however, there is more to it than meets the eye.

In Greek mythology, Olympus was created after the gods defeated the titans in the battle of Titanomachy; otherwise known as the War of the Titans. Atop its peak they then built the Pantheon, where Zeus sat upon his throne as King of Gods and the rest of the deities would convene to discuss matters of the world below and survey the world of men.

Seeing all these incredible mythological sites can be tricky, unless you charter a course aboard Deep Blue Yachting’s luxury sailing boat, the Glaros. It is a private vessel, you can set your own course and visit every site on this list, all in one trip.

By Cliff Blaylock