Like i understand it was probably during Pangea times, but i can’t wrap my head around it.
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Depending on where the dinosaurs were in relation to impact it’d either have been a quick or slow death.
Ones closest to impact would have died from the explosion itself, then further afield you get tsunamis that devastate the coastline, further afield again you actually get in-land earthquakes that cause in-land tsunamis on open bodies of water.
Also tiny pieces of molten metal would have been thrown up in the atmosphere but when they come down they’re still hot, which heats up the air but also causes mass forest fires.
After all of the initial major trauma deaths you’d have a lot of ash and debris in the atmosphere that cuts out sunlight and cools the planet. The plants die, the herbivores die, the carnivores die. Only smaller, adaptable mammals and dinosaurs survive until the atmosphere eventually clears up and plant colonisation recommences which in turn supports food chains again.
David Attenborough actually did a new documentary [Dinosaurs: The Final Day with David Attenborough](https://www.bbc.co.uk/iplayer/episode/m0016djt/dinosaurs-the-final-day-with-david-attenborough) about it recently. I found it very interesting and it’s all backed by new fossil discoveries.
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