Imagine you're listening to a song on the radio with your mom, and you both hear the song end at the same time. But after a few seconds, you say, "Mom, I think the song actually ended earlier than we thought." This is kind of like the Signor-Lipps Effect.
The Signor-Lipps Effect is a phenomenon where it can be difficult to tell exactly when a major event in Earth's history happened. For example, let's say a dinosaur became extinct millions of years ago. It's hard to know the exact moment that happened because we can't go back in time and watch it happen.
Scientists can use different methods to try to figure out when something happened, like looking at fossils or rocks. But even then, there might be some uncertainty. One way scientists try to narrow down the timing of events is by using something called the Signor-Lipps Effect.
Basically, the Signor-Lipps Effect says that the last occurrence of a fossil, rock layer, or other geologic event may not actually mark the true end of that event. Instead, there might be a gap of time between when we last see evidence of that event and when it actually ended. It's kind of like when the song ends but there's still some music fading out after it technically ended.
Scientists need to take the Signor-Lipps Effect into account when they're studying Earth's history so they can better understand when things happened and how they are related to each other.