Here's why:

* Geologic Time Scale: The geologic time scale is a vast system that divides Earth's history into eons, eras, periods, epochs, and ages. These divisions are based on major geological events like mass extinctions, significant climate shifts, or changes in dominant life forms.

* Continuous Processes: Geologic processes like erosion, sedimentation, and plate tectonics are ongoing. Therefore, the "present" is constantly being added to the geological record.

* Human Timescale vs. Geologic Timescale: Human history and even recorded history are relatively brief compared to the vast stretches of time in the geologic timescale. We can't realistically define a "geologic" interval within the last few hundred years.

For practical purposes, the shortest geologic interval commonly used is the Holocene Epoch, which began about 11,700 years ago and continues to the present.