 In 1956, Pecora published a review paper on carbonatites which are carbonate-silicate rocks containing a variety of minerals, including impressive reserve of rare commodities such as titanium, zirconium, and uranium.In a 1962 paper, Pecora concentrated on the carbonatite deposits in the Bearpaw Mountains.In 1957, Pecora was selected as Chief of the Branch of Geochemistry and Petrology within the United States Geological Survey.