Question 1

How do you say Miocene?

Accepted Answer

Miocene is pronounced MY-oh-seen. The stress falls on the very first syllable, so you say it almost like the word 'my' followed by 'oh' and then 'seen.' Many people accidentally say MEE-oh-seen or MY-oh-sen, but the correct ending rhymes with the word 'seen.' Try saying it slowly: MY, then oh, then seen, and then speed it up into one smooth word.

Question 2

What does Miocene mean?

Accepted Answer

Miocene comes from two ancient Greek words: meion, meaning less, and kainos, meaning new or recent. Put together, it roughly means less recent or less new. Scottish geologist Charles Lyell chose this name in 1833 because only about 18 percent of the fossil sea creatures from this epoch matched species still alive today, which was fewer than in the younger Pliocene epoch. So the name is literally a comparison, describing an epoch where fewer modern species had yet appeared.

Question 3

When was the Miocene epoch?

Accepted Answer

The Miocene epoch lasted from about 23.04 million years ago to 5.333 million years ago, a span of roughly 17.7 million years. It is part of the Neogene Period and comes after the Oligocene epoch and before the Pliocene epoch. To put that in perspective, the Miocene ended about 5 million years before the first early human ancestors appeared in Africa. It is considered part of the Cenozoic Era, the age of mammals.

Question 4

What animals lived in the Miocene?

Accepted Answer

The Miocene was packed with incredible animals that would amaze anyone who saw them. On land there were mastodons, early horses like Merychippus, giant ground sloths, saber-toothed cats, and a giant ape called Gigantopithecus that stood up to 10 feet tall. In the seas, Megalodon, a shark possibly 60 feet long, was the top predator, while early whales and dolphins were diversifying rapidly. Giant bony-toothed birds with 20-foot wingspans soared over the oceans.

Question 5

Did humans exist in the Miocene?

Accepted Answer

No, modern humans did not exist during the Miocene. However, some of our earliest distant relatives were alive during this epoch. Early apes like Proconsul lived in Africa during the Miocene, and by the late Miocene, around 6 to 7 million years ago, scientists believe the evolutionary lineage that would eventually lead to humans and chimpanzees was just beginning to split apart. The first true human ancestors, called hominins, appeared after the Miocene ended.

Question 6

Was Megalodon alive in the Miocene?

Accepted Answer

Yes, Megalodon first appeared during the early Miocene, around 23 million years ago, and was one of the most terrifying predators in the ocean throughout the epoch. This giant shark, estimated to reach up to 60 feet in length, fed on whales and large marine mammals. Megalodon survived beyond the Miocene into the Pliocene but went extinct roughly 3.6 million years ago. Its enormous teeth, some as large as a human hand, are found in Miocene and Pliocene fossil deposits around the world.

Question 7

What caused the Miocene to end?

Accepted Answer

The Miocene did not end with a dramatic extinction event but with a long, gradual cooling of Earth's climate. Starting around 14 million years ago, global temperatures dropped and the Antarctic ice sheet expanded significantly. By the end of the Miocene, around 5.333 million years ago, the world was noticeably cooler and drier than it had been at the start of the epoch. One dramatic event near the end was the drying of the Mediterranean Sea, called the Messinian Salinity Crisis, caused by tectonic activity that cut off the Mediterranean from the Atlantic Ocean.

Question 8

What is the Miocene climate optimum?

Accepted Answer

The Miocene Climatic Optimum was a warm period that occurred roughly 15 to 17 million years ago, during the middle of the Miocene epoch. Global temperatures during this time were about 3 to 4 degrees Celsius warmer than today, and carbon dioxide levels in the atmosphere were elevated. Tropical forests expanded, sea levels were higher, and biodiversity increased dramatically both on land and in the oceans. After this warm peak, temperatures began a long-term cooling trend that would eventually lead toward the ice ages of the Pleistocene.

Question 9

Who discovered the Miocene epoch?

Accepted Answer

The Miocene was not discovered in the way a fossil or a dinosaur is discovered. Instead, it was defined and named by Scottish geologist Charles Lyell in 1833. Lyell was one of the founders of modern geology and the author of the famous textbook Principles of Geology, which Charles Darwin read on the voyage of the HMS Beagle. Lyell studied fossil sea shells from rock layers across Europe and used the percentage of modern-looking species to classify and name different geological time intervals, inventing the Miocene and several other epoch names we still use today.

Question 10

What did Earth look like during the Miocene?

Accepted Answer

During the Miocene, the continents were positioned very close to where they are today, but the world looked quite different in terms of climate and geography. The Alps and Himalayas were actively rising due to continental collisions, and vast grasslands were spreading across Africa, Asia, and North America for the first time. Parts of what is now the Sahara Desert were covered in forests, and a large shallow sea called the Paratethys covered much of central Europe and western Asia. The Mediterranean Sea periodically shrank and nearly dried out near the end of the epoch.

Question 11

What is the difference between the Miocene and the Pliocene?

Accepted Answer

The Miocene came before the Pliocene and was generally warmer, more forested, and home to a wider variety of large mammals. The Pliocene, which ran from about 5.333 to 2.58 million years ago, was cooler and drier, and saw the beginnings of the ice age cycles that would intensify in the following Pleistocene epoch. In terms of life, the Pliocene is when early human ancestors like Australopithecus were walking upright in Africa, something that had not yet happened during the Miocene. Megalodon, which thrived in the Miocene, went extinct during the Pliocene around 3.6 million years ago.

Question 12

Why did grasslands spread during the Miocene?

Accepted Answer

Grasslands spread during the Miocene because of a combination of cooling temperatures, reduced rainfall in continental interiors, and rising mountain ranges that blocked moisture from reaching inland areas. Grasses had existed before the Miocene but were limited to certain regions. As the climate cooled and dried, forests retreated and open grasslands expanded dramatically across Africa, Asia, Europe, and the Americas. This transformation drove a wave of evolution in grazing animals, particularly horses and ancient cattle relatives, which developed longer legs, tougher hooves, and high-crowned teeth specially adapted to chew abrasive grass.

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