Citing continued rapid growth of the church, LDS officials on Saturday announced formation of an additional quorum of seventy and the appointment of 12 new general authorities to guide that growth.

Creation of a Second Quorum of the Seventy was announced by President Thomas S. Monson, second counselor in the First Presidency, during the Saturday afternoon session of conference.Word of the changes, approved by the First Presidency and Council of the Twelve, came during a sustaining of general officers of the 6.7 million-member church.

President Monson said the First Presidency and Council of the Twelve have "determined that the time has come to take additional steps to provide for the expansion and regulation of the church."

Initial members of the Second Quorum of the Seventy, whose organization became effective Saturday, will be 28 of those general authorities presently serving a five-year assignment, plus eight new members. The 28 will serve for five years from their initial calls as general authorities.

President Monson said additional members will be added to the second quorum from time to time and will serve as general authorities for five-year periods.

He said the First Quoroum of the Seventy will continue much as at present, with 35 members, including Elders John K. Carmack and Hans B. Ringger, whose initial calls were for five years, and four new members whose calls were with 35 members, including Elders John K. Carmack and Hans B. Ringger, whose announced Saturday.

In the future the first quorum may be expanded with members called from the Second Quorum of the Seventy or from the priesthood at large.

The current presidency of the First Quorum of the Seventy will serve as presidents of both quorums.

Members of the First and Second Quorums of the Seventy have responsibility to administer the affairs of the church worldwide under direction of the First Presidency and Council of the Twelve.

Some quorum members are executive directors of departments at church headquarters in Salt Lake City; others are assigned as members of area presidencies responsible for church administration in 18 geographical areas worldwide. Those assigned to area presidencies outside the United States or Canada live in their areas.

Newly called general authorities who will serve in the First Quorum of the Seventy are Ricks College President Joe J. Christensen, Utah Board of Regents Chairman W. Eugene Hansen, Brigham Young University President Jeffrey R. Holland and Huntsville attorney Marlin K. Jensen.

Called to serve five years in the Second Quorum of Seventy were Carlos Amado, Benjamin Berry Banks, Spencer J. Condie, Floyd Melvin Hammond, Malcolm Seth Jeppsen, Richard P. Lindsay, Merlin Rex Lybbert and Horacio Antonio Tenorio.

-Joe J. Christensen, 59, is president of Ricks College in Rexburg, Idaho, and a regional representative. He has close ties with Mexico, having served there as a mission president and a missionary.

Married to Barbara Kohler and the father of six, his church experience includes callings as a counselor in the general presidency of the church Sunday School, president of the Missionary Training Center in Provo and member of the general boards of the Young Men and Melchizedek Priesthood MIA. He is a former associate commissioner of church education and director of the University of Utah Institute of Religion.

-W. Eugene Hansen, 60, is a private attorney and chairman of the state Board of Regents. He also is a former president of the Utah State Bar Association.

Married to Jeanine Showell and the father of six, Elder Hansen is president of the Salt Lake Bonneville Stake and a former bishop of the Bonneville 1st Ward.

-Jeffrey R. Holland, 48, has been president of Brigham Young University since 1980. He also is a professor of English and of ancient scripture.

He has been church commissioner of education, dean of the BYU College of Religion and an instructor or director at institutes of religion in California, Washington, Connecticut and Salt Lake City.

Elder Holland's previous church callings include regional representative, counselor in three stake presidencies, bishop, director of the Melchizedek Priesthood MIA, chairman of the church's young adult committee and missionary in Great Britain. He and his wife, Patricia Terry, have three children.

-Marlin K. Jensen, 46, is a private attorney from Huntsville, Weber County. He is serving as a regional representative.

He has served as president of the Huntsville Utah Stake and bishop of the Huntsville Ward. He and his wife, Kathleen Bushnell, have seven children.

-Carlos Amado, 44, is area director of the Church Educational System in Guatemala City, Guatemala, and a regional representative.

His church experience includes callings as mission president, stake president and bishop in Guatemala and missionary in the Andes Mission. He and his wife, Mayavel Pineda, have five children.

-Benjamin Berry Banks, 56, is president of the Scotland Edinburgh Mission. He is owner and president of Intermountain Lumber Co. in Salt Lake City.

His church experience includes callings as president of the Salt Lake South Cottonwood Stake and bishop of three wards. He and his wife, Susan Kearnes, are parents of seven children and one foster son.

-Spencer J. Condie, 48, is a sociology professor at BYU, where he has earned the Karl G. Maeser Distinguished Teaching Award.

A regional representative, he is the former president of the Austria Vienna Mission and has served as a stake president and bishop of two wards. He is married to Dorothea Speth and has five children.

-Floyd Melvin Hammond, 56, is a religion professor at Ricks College, where he serves as high priest group leader in his ward.

He previously served as president of the Bolivia Cochabamba Mission and as a stake president, bishop, officiator in the Idaho Falls Temple and missionary in the Spanish-American Mission. He and his wife, Bonnie Evona Sellers, have six children.

-Malcolm Seth Jeppsen, 64, is a family practice physician in Salt Lake City. He is a sealer in the Salt Lake Temple and an elders quorum instructor.

He has previously served as a regional representative, elders quorum president, stake president and bishop. He and his wife, Marian Davis, are parents of five children.

-Richard P. Lindsay, 63, is managing director of the church Public Communications and Special Affairs Department. He is a former state legislator and executive director of the Utah Department of Social Services.

His church experience includes callings as stake president, bishop and missionary in Switzerland. He and his wife, Marian Bangerter, have six children.

-Merlin Rex Lybbert, 63, is a private attorney in Salt Lake City and was honored as Utah Trial Lawyer of the Year in 1981-82.

He is a regional representative and a former stake president, bishop and missionary in the Eastern States Mission. He is married to Nola Cahoon and has six children.

-Horacio Antonio Tenorio, 54, is a businessman and consultant in Guadalajara, Mexico.

He is serving as a regional representative for the second time and is a former president of the Mexico Torreon Mission, stake president, bishop and branch president.

He and his wife, Maria Teresa de Tenorio, are parents of three daughters.