A method comprising: obtaining by a computer system a plurality of values indicative of characteristics of an underground formation; plotting by the computer system the plurality of values on an output device of the computer system by: plotting parallel to a first axis a first plurality of symbols where a size of each symbol is indicative of a value of a characteristic of a first portion of the underground formation, a location of the first plurality of symbols with respect to the first axis being indicative of a first parameter, and said location of the first plurality of symbols with respect to a second axis being indicative of a second parameter distinct from the first parameter; and plotting parallel to the first axis a second plurality of symbols where a size of each symbol is indicative of a value of the characteristic of a second portion of the underground formation, a location of the second plurality of symbols with respect to the first axis being indicative of the first parameter, and said location of the second plurality of symbols with respect to a second axis being indicative of the second parameter; and wherein the location of at least one symbol from each plurality of symbols with respect to the first axis is also indicative of a third parameter, different than the first and second parameters, the method being characterized in that the first parameter is geologic time, the second parameter is present-day horizontal location, and the third parameter is present-day depth of the respective portion of the underground formation. obtaining by a computer system a plurality of values indicative of characteristics of an underground formation; plotting by the computer system the plurality of values on an output device of the computer system by: plotting parallel to a first axis a first plurality of symbols where a size of each symbol is indicative of a value of a characteristic of a first portion of the underground formation, a location of the first plurality of symbols with respect to the first axis being indicative of a first parameter, and said location of the first plurality of symbols with respect to a second axis being indicative of a second parameter distinct from the first parameter; and plotting parallel to the first axis a second plurality of symbols where a size of each symbol is indicative of a value of the characteristic of a second portion of the underground formation, a location of the second plurality of symbols with respect to the first axis being indicative of the first parameter, and said location of the second plurality of symbols with respect to a second axis being indicative of the second parameter; and wherein the location of at least one symbol from each plurality of symbols with respect to the first axis is also indicative of a third parameter, different than the first and second parameters, the method being characterized in that the first parameter is geologic time, the second parameter is present-day horizontal location, and the third parameter is present-day depth of the respective portion of the underground formation. plotting parallel to a first axis a first plurality of symbols where a size of each symbol is indicative of a value of a characteristic of a first portion of the underground formation, a location of the first plurality of symbols with respect to the first axis being indicative of a first parameter, and said location of the first plurality of symbols with respect to a second axis being indicative of a second parameter distinct from the first parameter; and plotting parallel to the first axis a second plurality of symbols where a size of each symbol is indicative of a value of the characteristic of a second portion of the underground formation, a location of the second plurality of symbols with respect to the first axis being indicative of the first parameter, and said location of the second plurality of symbols with respect to a second axis being indicative of the second parameter; and wherein the location of at least one symbol from each plurality of symbols with respect to the first axis is also indicative of a third parameter, different than the first and second parameters, the method being characterized in that the first parameter is geologic time, the second parameter is present-day horizontal location, and the third parameter is present-day depth of the respective portion of the underground formation.