

Dear all,

I have a large dataset of fossil record of pollen. I'm interested in study of the relation spatial and temporal of this dataset.

For each record I have four variables: location (X,Y), age and abundance.

I'm exploring the new packages "space-time". Because I want to interpolate the abundance of a particular specie with krigeST function.

My question is related with the time format. because to set a ST-class object, the time must to be an object of class xts, and
the time in my dataset is not representing with calendar dates, my data set is in the geological time scale (Million of years ago, "Ma")

Something like that:

 age_Ma <- c(14.52, 17.21, 23.12, 15,6)    ##  dates in million of years ago 

Any advice "trick" how transform a vector like this in an xts object?

Regards,

John 
 		 	   		  
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