Guest Video: “Ancient Dog”! Unexpectedly, in San Diego Construction Site

The news of this discovery is a couple of years old; because of the COVID lockdown, it took them a while to identify the “ancient dog” in this fossil bed:

We’re not talking about someone’s lost elderly pet.

It’s so old a creature that I found no good feature images and went with a fox because everyone calls its fossils “fox-like.”

It’s Archaeocyon — science-speak for “ancient dog.”

This multimillion-year-old canid probably came after the days of Pangurban — the other fossil San Diego carnivore we’ve met — but there were plenty of other cat-like nimravids around, and it’s unlikely that Archaeocyon barked at any of these apex predators or chased them up trees.

“MEOW!” — Hoplophoneus. (Image: ghedoghedo via Wikimwedia, CC BY- SA 3.0)

Little Archaeocyon sounds like a total wuss, according to Dr. Wikipedia:

Archaeocyon was a comparatively small and unspecialized dog. Its dentition (teeth) suggests a slightly more hypocarnivorous (omnivorous) diet than the otherwise similar Hesperocyon. The skeleton is also generalized, lacking specializations for running and retaining a plantigrade foot posture.

But I think it was badass in at least two ways:

  1. Despite the nimravids and other predators, fox-like Archaeocyon is considered one of the ancestral “bone-crushing dogs.”
  2. It lived for millions of years upwind and next door to Hell: the ignimbrite flareup that blasted out some 500,000 cubic km of volcanic debris across western North America. (Source, with a jargon alert)
  3. We’ll take a look at that flareup tomorrow.

    Eventually, towards the end of the explosive period, Archaeocyon disappeared, as did nimravids (leaving a “cat gap” in the North American fossil record until a pseudaelurine felid prowled in across a land bridge some 16 million years ago).

    But during that flareup the White River Fauna downwind thrived.


    I have no idea. It’s one of the more puzzling and complex parts of the story of how cats — and dogs — evolved.


    I like the cat statue.

    Featured image: Image by Jevgeni Fil from Pixabay

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