Dataset - B2FIND

(Table 1) Carbonate and related data from the Caravaca K/T boundary section, ...

Distance refers to 80 cm thick interval spanning the K/T boundary at Caravaca (-40 to + 40 cm in which the base of the fallout lamina is defined as 0 cm; positive and negative...

You can also access this registry using the API (see API Docs).