We are in the Holocene epoch, which began 11,700 years ago at the end of the last major ice age. Despite growing public use of the term “Anthropocene,” that proposal was formally rejected by geologists in 2024. The Holocene remains the official epoch on the International Chronostratigraphic Chart, most recently updated in December 2024.
Where the Holocene Fits in Earth’s Timeline
Geologists divide Earth’s 4.5-billion-year history into a nested hierarchy: eons, eras, periods, and epochs. The Holocene sits inside all of them. We live in the Phanerozoic Eon (the last 538 million years, when complex life has existed), within the Cenozoic Era (the last 66 million years, since the dinosaur extinction), within the Quaternary Period (the last 2.6 million years, defined by repeated glacial cycles). The Holocene is the latest slice of that Quaternary stack.
Before the Holocene came the Pleistocene epoch, which ran from about 2.6 million to 11,700 years ago. The Pleistocene was dominated by advancing and retreating ice sheets. When those glaciers pulled back for the most recent time, the Holocene began, and it has been a relatively warm, stable stretch of climate ever since. We are, technically, living in an interglacial period: a warm gap between ice ages.
What Makes the Holocene Distinct
The transition from Pleistocene to Holocene was dramatic. Permafrost that had covered vast stretches of northern Europe and Asia began to thaw. Glacial sediments on ocean floors gave way to purely marine deposits. Forests spread across plains that had been treeless tundra, and the landscape itself shifted as buried ice wedges melted and reshaped the terrain. For prehistoric humans, this was a pivotal moment: the shrinking of stable river terraces and open land forced changes in settlement and migration patterns for hunter-gatherer communities.
Since that initial warming, the Holocene has seen smaller climate fluctuations. The most notable was the “Little Ice Age” between roughly 1200 and 1700 AD, when temperatures dipped enough to freeze European rivers and shorten growing seasons. But compared to the wild swings of the Pleistocene, the Holocene has been remarkably steady. That stability is, in many ways, the backdrop for the rise of agriculture, cities, and civilization as we know it.
How Geologists Draw the Line Between Epochs
An epoch boundary isn’t just a date someone picks. It requires a physical marker in rock or sediment that scientists can point to anywhere in the world. The International Commission on Stratigraphy calls this a Global Boundary Stratotype Section and Point, or GSSP. Think of it as a “golden spike” driven into a specific outcrop of rock that represents the moment one epoch ended and another began.
The requirements are strict. The boundary must show an observable, unambiguous change in the physical properties or fossil content of the rock. There should be secondary markers (chemical shifts, magnetic reversals, other fossil changes) that reinforce the signal. And crucially, those same markers must show up in rock sections across different regions of the world, not just one location. The sediment layers also need to be continuous, with no gaps or abrupt changes in how the rock was deposited. This high bar is what makes geological time divisions reliable, and it’s also what made the Anthropocene proposal so contentious.
What Happened to the Anthropocene
For over a decade, a working group of scientists argued that human activity has changed the planet so fundamentally that we’ve entered a new epoch. The case wasn’t trivial. Starting around 1952, global rock and sediment layers began recording signals that have no precedent in Earth’s history: plutonium from nuclear weapons testing, synthetic chemicals like DDT and PCBs, and microplastics. A sediment core from Beppu Bay in Japan, one of the leading candidate sites for a golden spike, shows the first appearance of microplastics in 1954 and sharp spikes in artificial radioactive isotopes in the early 1950s. The peak of these “anthropogenic fingerprints” across global archives was detected in 1953.
The formal proposal placed the start of the Anthropocene around 1950, during what scientists call the Great Acceleration, when industrial output, population growth, and chemical pollution all surged simultaneously. Plutonium from atmospheric nuclear tests was proposed as the primary boundary marker because it appears synchronously in sediments worldwide.
In early 2024, the Subcommission on Quaternary Stratigraphy voted the proposal down, with 66% voting against. The decision was binding: the proposal cannot advance further under the organization’s current rules. The chair of the subcommission later challenged the vote’s procedural validity and requested an inquiry, but as of the December 2024 update to the International Chronostratigraphic Chart, the Holocene remains the current epoch with no Anthropocene addition.
Why the Proposal Failed
The rejection wasn’t a denial that humans have transformed the planet. The disagreement was about whether “epoch” is the right geological category for that transformation. One major objection, outlined in a U.S. Geological Survey publication, is that human impacts on the environment are diachronous, meaning they happened at different times in different places. Agriculture reshaped ecosystems in the Middle East thousands of years before it did so in the Americas. Deforestation, urbanization, and pollution ramped up on different timelines across different continents. Pinning all of that to a single global start date in 1952 struck many geologists as artificially neat.
The alternative view, gaining traction among some scientists, is to treat the Anthropocene as a geological “event” rather than a formal epoch. Events in stratigraphy don’t require a single fixed start date. They can be spread across time and space, which better reflects the messy, uneven reality of how humans have altered Earth’s systems. This framing still acknowledges the unprecedented scale of human impact while fitting more naturally into the geological record.
The Holocene’s Subdivisions
The Holocene itself is divided into three ages. The Greenlandian (11,700 to 8,200 years ago) covers the initial post-glacial warming. The Northgrippian (8,200 to 4,200 years ago) follows a notable cold event visible in Greenland ice cores. The Meghalayan, which began 4,200 years ago, is the age we currently live in. It was defined by a severe global drought that collapsed civilizations from Egypt to China, with its golden spike placed in a stalagmite in Meghalaya, India.
So the most precise answer to “what epoch are we in” is: the Holocene epoch, Meghalayan age, within the Quaternary Period of the Cenozoic Era. That classification was reaffirmed as recently as December 2024 by the body responsible for maintaining Earth’s official geological timeline.